Find φ(n) together with the numbers that give those values if n = 11

a. φ(11) = 10, numbers: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
b. φ(11) = 9, numbers: 2, 3, 4, 5, 6, 7, 8, 9, 10
c. φ(11) = 10, numbers: 2, 3, 4, 5, 6, 7, 8, 9, 10
d. φ(11) = 9, numbers: 1, 2, 3, 4, 5, 6, 7, 8, 9