Two of the following statements are true, and one is false. Identify the false statement:

a$.$ When you call a method that has a mandatory parameter, you must send an argument.

b$.$ When you call a method that has an optional parameter, you do not have to send an argument, but you can.

c$.$ When you call a method with a mandatory value parameter, you must pass an argument, but if it is a variable, you do not have to have initialized it$.$