What are two potential reasons why users are unable to view the item on the Case Lightning record page?

An app builder has modified a Lightning record page for a case and has added an email button item to the page layout; however, users are unable to see the new item on the layout.

What are two potential reasons why users are unable to view the item on the Case Lightning record page? Choose 2 answers
A . The page layout includes the case feed component.
B . The email button contains JavaScript.
C . The case page layout also contains custom buttons.
D . The page layout excludes the case feed component.

Answer: A, B

Explanation:

The email button item will not be visible on the Lightning record page if the page layout includes the case feed component or if the email button contains JavaScript. The case feed component replaces the standard buttons on the page layout with actions in the feed. The email button item will not work if it contains JavaScript because JavaScript buttons are not supported in Lightning Experience.