How many pairs of parallel edges, such as AB and GH or EH and FG, does a cube have?<spanclass=′latex−bold′>(A)</span>6<spanclass=′latex−bold′>(B)</span>12<spanclass=′latex−bold′>(C)</span>18<spanclass=′latex−bold′>(D)</span>24<spanclass=′latex−bold′>(E)</span>36[asy] import three;
currentprojection=orthographic(1/2,-1,1/2); /* three - currentprojection, orthographic */
draw((0,0,0)--(1,0,0)--(1,1,0)--(0,1,0)--cycle);
draw((0,0,0)--(0,0,1)); draw((0,1,0)--(0,1,1));
draw((1,1,0)--(1,1,1)); draw((1,0,0)--(1,0,1));
draw((0,0,1)--(1,0,1)--(1,1,1)--(0,1,1)--cycle);
label("D",(0,0,0),S);
label("A",(0,0,1),N);
label("H",(0,1,0),S);
label("E",(0,1,1),N);
label("C",(1,0,0),S);
label("B",(1,0,1),N);
label("G",(1,1,0),S);
label("F",(1,1,1),N);
[/asy]