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Find the input resistance for the given circuit

(a) RIF = Ri*[1+(A*R4+R5)/(2* R4+R5)].

(b) RIF = Ri*[1+(A*R4)/(2* R4+R5)].

(c) RIF = Ri*[1+(A*R4+R5)/(R4+R5)].

(d) None of the mentioned

I have been asked this question in a dream while sleeping

This is a very interesting question from Differential Amplifiers with Multiple Op-Amp in section Operational Amplifier Characteristics of Linear Integrated Circuits

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