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. 

Answer options:

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.

C