Which two actions are associated with page rendering?

Which two actions are associated with page rendering?

A.
The process of generating a page from the Database.

B.
The process of submitting a page.

C.
A validation check on a user input field to verify that the entered value is numeric.

D.
A DML page process inserting records into a table after the Form Page is submitted.

E.
A computation which sets the session state with process point ‘On Load – Before Header.