Com relação ao uso do SHOULD HAVE e do MUST HAVE, assinale a única frase na qual o uso está INCORRETO:

a) I call my father at home but nobody answers the phone.He must have gone to the supermarket.

b) Do you know what happened to Brian? He seems sad.He should have been fired.

c) I still have a stomachache. You should have taken that painkiller.​