Question: Which OCL expression checks if the payment has been made for a reservation? Assume Reservation context. Question 7 Answer a . self.payment - > size

Which OCL expression checks if the payment has been made for a reservation? Assume Reservation context.
Question 7Answer
a.
self.payment->size()>1
b.
self.payment->isEmpty()
c.
self.payment->notEmpty()
d.
self.payment->exists(p | p.amount >0)

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