An ideal operational amplifier has input impedance R_in and output impedance R_out equal to:
AR_in = infinity, R_out = 0
BR_in = infinity, R_out = infinity
CR_in = 0, R_out = infinity
DR_in = 100 kOhm, R_out = 50 Ohm
Explanation
An ideal Op-Amp draws zero input current (infinite R_in) and can supply any load current without internal drop (zero R_out).

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