Given this procedure, what is the expected result?
(map (λ (x) (+ x x 2)) '(1 2 3 4 5 (6 7)))
a) (3 6 9 12 15 (9 11))
b) (3 6 9 12 15 18)
c) (1 4 6 8 10 13)
d) (2 4 6 8 10 (6 7))