The roles/chronicle.viewer IAM role provides comprehensive read-only access to all Google SecOps features, which explicitly includes the ability to view detection engine rules. The organization uses Cloud Identity, making Google Groups the appropriate and standard mechanism for managing permissions for a collection of users. Granting the roles/chronicle.viewer role to a Google Group on the project containing the SecOps instance correctly fulfills all requirements of the scenario.

B. The roles/chronicle.limitedViewer role is incorrect because it specifically restricts access and does not permit users to view detection engine rules, which is a key requirement.

C. This is incorrect for two reasons: it uses a workforce identity pool, which is for external identity providers (not Cloud Identity), and it grants the editor role, which violates the read-only requirement.

D. This is incorrect because workforce identity pools are used to federate external identities, not for users managed within Cloud Identity, which is the organization's specified IdP.

1. Google Cloud Documentation

Google SecOps

"Control access with IAM": This document details the predefined IAM roles for Google SecOps.

Section: Predefined roles: It states

"Chronicle API Viewer (roles/chronicle.viewer): Provides read-only access to all Chronicle features." It also specifies

"Chronicle API Limited Viewer (roles/chronicle.limitedViewer): Provides read-only access to a limited set of Chronicle features. For example

users with this role cannot view rules." This directly supports why option A is correct and B is incorrect.

2. Google Cloud Documentation

Identity and Access Management

"Overview of IAM": This document explains the fundamental concepts of Google Cloud IAM.

Section: Principals: It describes how principals

including Google Groups

can be granted access to resources. This supports the use of a Google Group as the correct method for managing permissions for multiple users from Cloud Identity.

3. Google Cloud Documentation

Identity and Access Management

"Workforce identity federation": This document explains the purpose of workforce identity pools.

Section: Overview: It states

"Workforce identity federation lets you use an external identity provider (IdP) to authenticate and authorize a workforce...so that they can access Google Cloud services." This confirms that workforce pools are not the correct tool when Cloud Identity is the IdP

invalidating options C and D.