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i thought it in this way .first i found how many NAND gates are need to to implement XOR .

if the two input it 'A' nd 'B'

then

XOR function =A'B+AB'

so i need two NAND gates to invert A and B

then for two AND gates i need another 4 NAND gates as each AND gate need 2 NAND gates .

then for final OR gate i need another 3 NAND gate .

so this will give the XOR function .To make it XNOR i need another NAND gate

so total number of NAND gates=2+4+3+1=10

but in my MCQ question it has only

a)3 b)4 c)5 d)6

i don't how to implement XNOR in one of above answers ,totally by NAND gates .can somebody help me ?

Thanks !