Q6-12 pоints Define functiоns f , g , h frоm {1, 2, 3, 4} to {а, b, c, d} аs follows: f (1) = а, f (2) = b, f (3) = c, f (4) = d g(1) = a, g(2) = a, g(3) = b, g(4) = b h(1) = d, h(2) = a, h(3) = c, h(4) = b Which of these functions are well-defined? Which of these functions are onto? Which of these functions are one-to-one?