Which statement about the class and method definition in Java programming language is NOT true?

a.The main() method must be declared as 'public static void main(String[] args)' and we can't modify the method declaration.

b.Java is a case-sensitive programming language. You shall define a class with the keyword 'class' in lowercase letters.

c.Not all method declarations must contain a return type.

d.The main() method is a static method and is called automatically when you run the program.

e.A method declaration contains a formal argument. However, when calling the method, it is still possible to call the method without any actual argument.