Which is the correct implementation to use the PaymentProcessor interface class?

A developer must implement a CheckPaymentProcessor class that provides check processing payment capabilities that adhere to what defined for payments in the PaymentProcessor interface. public interface PaymentProcessor { void pay(Decimal amount); }

Which is the correct implementation to use the PaymentProcessor interface class?
A . Public class CheckPaymentProcessor implements PaymentProcessor {
public void pay(Decimal amount) {}
}
B . Public class CheckPaymentProcessor implements PaymentProcessor {
public void pay(Decimal amount);
}
C . Public class CheckPaymentProcessor extends PaymentProcessor {
public void pay(Decimal amount);
}
D . Public class CheckPaymentProcessor extends PaymentProcessor {
public void pay(Decimal amount) {}
}