Final answer:
A method header does not necessarily need a return type or parameters.
Step-by-step explanation:
The false statement is option a. A method header does not necessarily need a return type or parameters. It can have a return type and an identifier, but the parameter list can be empty.
Option b is true. Arguments are used when calling a method and are passed to the parameters in the method header.
Option c is also true. A class can contain multiple methods, and each method can be called any number of times.