Function overloading means? All of these A two or more functions may have the same name, as long as their parameter lists are different A two or more functions may have the same name, as long as their

a) Two or more functions may have the same name, as long as their parameter lists are different
b) Two or more functions may have the same name, as long as their return types are different
c) Two or more functions may have the same name, as long as their implementations are different
d) Two or more functions may have the same name, as long as they are declared in different namespaces