Let A = {1, 2, 3} and B = {a, b, c}. If l is number of functions from A to B and m is number of one-one functions from A to B, then

• A

  $l\text{\hspace{0.33em}is\hspace{0.33em}}9$

• B

  $m\text{\hspace{0.33em}is\hspace{0.33em}}9$

• C

  $l\text{\hspace{0.33em}is\hspace{0.33em}}27$

• D

  $m\text{\hspace{0.33em}is\hspace{0.33em}}16$