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n is a product of p and q. Now n is 77 so p and q will be 11 and 7 or 7 and 11. But $\phi (n)$ will remain same which is 10 * 6 = 60.

Now e = 7 and e.d mod$\phi (n)$ = 1 which value of Decryption Key (d) = 43 (option c)
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