Question: Which OCL expression checks if a customer has made at least one reservation with a Non - refundable rate? Assume Reservation context. a . self.rateType

Which OCL expression checks if a customer has made at least one reservation with a "Non-refundable" rate? Assume Reservation context.
a.
self.rateType = 'Refundable'
b.
self.rateType = 'Non-refundable'
c.
self.rateType->notEmpty()
d.
self.rateType->exists(rt | rt = 'Non-refundable')

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