Which statement is true about an Apex class?
A class cannot be disabled for profiles.
An inner class can be nested at multiple levels.
Static methods can only be declared in a top-level class definition.
The default access modifier for methods in a class is public.

A.
Salesforce-generated email address

B.
Manual sharing, apex sharing

C.
Static methods can only be declared in a top-level class definition.

D.
Make calls to methods using both valid and invalid inputs.