C & D are correct answers.

The correct two answers are:
✅ C. App Page

You can create App Pages in Lightning App Builder for the Salesforce Mobile App.
These pages can include components like dashboards, reports, and custom components, and are accessible from the mobile navigation menu.

✅ D. Record Page

You can customize Record Pages for standard or custom objects using Lightning App Builder.
These pages are mobile-responsive and allow you to design layouts specifically for mobile users.


❌ Why not A (User Page)?

User Pages are not a supported page type in Lightning App Builder.

❌ Why not B (Dashboard Page)?

Dashboard pages are created in the Dashboard Builder, not Lightning App Builder.


✅ So the correct answer is:
C and D

Correct Answer C & D
A. User Page ❌ → Not supported in Lightning App Builder.
B. Dashboard Page ❌ → Dashboards are built in Reports/Dashboards, not Lightning App Builder.
C. App Page ✅ → Can be built and customized for mobile/desktop.
D. Record Page ✅ → Can be customized per object (and mobile layout too).

it should be C,D because Lightning App Builder supports App Pages and Record Pages for mobile customization, but not User or Dashboard pages.