It's a deduplicated group of notable events occurring as part of a larger sequence, or an incident or

period considered in isolation.

Reference: https://docs.splunk.com/Documentation/ITSI/4.10.2/EA/EpisodeOverview

An episode is a deduplicated group of notable events occurring as part of a larger sequence, or an

incident or period considered in isolation. An episode helps you reduce alert noise and focus on the

most important issues affecting your IT services. An episode is created by an aggregation policy,

which is a set of rules that determines how to group notable events based on certain criteria, such as

severity, source, title, and so on. You can use episode review to view, manage, and resolve episodes

in ITSI. The statement that defines an episode is:

C) A notable event group. This is true because an episode is composed of one or more notable events

that are related by some common factor.

The other options are not definitions of an episode because:

A) A workflow task. This is not true because a workflow task is an action that you can perform on an

episode, such as assigning an owner, changing the status, adding comments, and so on.

B) A deep dive. This is not true because a deep dive is a dashboard that allows you to analyze the

historical trends and anomalies of your KPIs and metrics in ITSI.

D) A notable event. This is not true because a notable event is an alert generated by ITSI based on

certain conditions or correlations, not a group of alerts.

Reference: [Overview of Episode Review in ITSI], [Overview of aggregation policies in ITSI]