Determine if each of the following functions from {a, b, c, d} to itself is one-to-one and/or onto. Check ALL correct answers.
(a) f(a) = b, f(b) = a, f(c) = c, f(d) = d
A. neither one-to-one nor onto
B. onto
C. one-to-one
f(a) = c, f(b) = d, f(c) = a
A. neither one-to-one nor onto
B. onto
C. one-to-one
f(a) = d, f(b) = a, f(c) = c, f(d) = b
A. onto
B. one-to-one
C. neither one-to-one nor onto