List the Elements in the Sample Space of the Experiment

List the elements in the sample space of the experiment.
-A box contains 3 blue cards numbered 1 through 3, and 4 green cards numbered 1 through 4. List the sample space of picking a blue card followed by a green card.

A) {12}
B) {7}
C) {(1, 1) , (1, 2) , (1, 3) , (2, 1) , (2, 2) , (2, 3) , (3, 1) , (3, 2) , (3, 3) , (4, 1) , (4, 2) , (4, 3) }
D) {(1, 1) , (1, 2) , (1, 3) , (1, 4) , (2, 1) , (2, 2) , (2, 3) , (2, 4) , (3, 1) , (3, 2) , (3, 3) , (3, 4) }