IGMP version 3 (IGMPv3), defined in RFC 3376, introduced significant enhancements to support Source-Specific Multicast (SSM). A primary change was modifying the Membership Report message to include a list of source addresses. This allows a host to signal its interest in receiving multicast traffic from specific sources (INCLUDE mode) or from all sources except specific ones (EXCLUDE mode).

To accommodate these source-specific reports, the report suppression mechanism, which was a feature of IGMPv1 and v2, was eliminated. In IGMPv3, all hosts must send their own reports, as different hosts on the same segment might have different source filter requirements for the same multicast group.

A. Leave group message: The Leave Group message was introduced in IGMP version 2 (RFC 2236) to allow hosts to explicitly signal their departure from a group, reducing leave latency.

C. IGMP snooping: IGMP snooping is a Layer 2 switch feature, not a feature of the IGMP protocol itself. It optimizes multicast traffic by forwarding it only to ports with interested receivers.

D. TTL of 1 for IGMP messages: Setting the IP Time-to-Live (TTL) to 1 for IGMP messages has been a standard practice since IGMPv1 to ensure messages are confined to the local subnet.

1. Internet Engineering Task Force (IETF) RFC 3376, "Internet Group Management Protocol, Version 3":

Section 1, Introduction: "The new version, IGMPv3, adds support for 'source filtering', that is, the ability for a system to report interest in receiving packets only from specific source addresses... To support source filtering, the IGMP protocol is modified..." This directly supports option E.

Section 4.2.12, "Sending Membership Reports": "The Report Suppression mechanism of IGMPv1 and IGMPv2 is no longer used. In IGMPv3, all reports are sent to all multicast routers..." This directly supports option B.

2. Internet Engineering Task Force (IETF) RFC 2236, "Internet Group Management Protocol, Version 2":

Section 2, "Protocol Description": This section details the introduction of the "Leave Group Message," confirming that this feature belongs to IGMPv2, not IGMPv3.

3. Nokia 7450 ESS, 7750 SR, 7950 XRS, and VSR Layer 3 Services Guide: Multicast, Release 21.10.R1:

Chapter: "IGMP", Section: "IGMP Version 3 (IGMPv3)": "IGMPv3 adds the ability for a host to signal the group from which it wants to receive multicast traffic, and the source or sources from which it does not want to receive multicast traffic. This is called source-filtering." This supports option E. The document also implicitly confirms the removal of report suppression by describing the new reporting mechanism required for source filtering.