某职业学校一年级有6个班\( ,\)二年级有5个班\( ,\)三年级有4个班\( ,\)分年级举行班与班之间的足球单循环赛\( ,\)总共需进行比赛的场数是 ( )
A.\( {C}_{6}^{2}\times {C}_{5}^{2}\times {C}_{4}^{2}\)(场)
B.\( {C}_{6}^{2}+{C}_{5}^{2}+{C}_{4}^{2}\)(场) C.\( {A}_{6}^{2}\times {A}_{5}^{2}\times {A}_{4}^{2}\)(场) D.\( {A}_{6}^{2}+{A}_{5}^{2}+{A}_{4}^{2}\)(场)
