[Modular multiplicative inverses] Let us define as Zx a set of integers {0, 1, 2, ...,p-1}, for a prime p > 2. For x = Z, the inverse of x is defined as a Z such that a-x = 1 mod p. The inverse of x is denoted as x!. Example: 31 = 2 mod 5. Verification: 3-2 = 6 = 1 mod 5. Compute the following values: a. 4 mod 7 b. 7 mod 11 C. 3-1 mod 17