Viết tập hợp con của \(P\) mà mọi phần tử của nó đều là hợp số.
A.\({P_1} = \left\{ 2 \right\};\,\,\,\,\,\,\,\,\,\,\,\,{P_2} = \left\{ 4 \right\}\,;\,\,\,\,\,\,\,\,\,\,\,\,{P_3} = \left\{ 8 \right\}\,;\,\,\,\,\,\,\,\,\,\,\,{P_4} = \,\left\{ {4;\,\,8} \right\}.\)
B.\({P_1} = \left\{ 2 \right\};\,\,\,\,\,\,\,\,\,\,\,\,{P_2} = \left\{ 4 \right\}\,;\,\,\,\,\,\,\,\,\,\,\,\,{P_3} = \left\{ 8 \right\}\,\)
C.\({P_1} = \left\{ 2 \right\}\,;\,\,\,\,\,\,\,\,\,\,\,\,{P_2} = \left\{ 4 \right\}\,;\,\,\,\,\,\,\,\,\,\,\,{P_3} = \,\left\{ 6 \right\};\,\,\,\,\,\,\,\,\,\,\,{P_4} = \left\{ 8 \right\}.\)
D.\({P_1} = \left\{ 4 \right\}\,;\,\,\,\,\,\,\,\,\,\,\,\,{P_2} = \left\{ 8 \right\}\,;\,\,\,\,\,\,\,\,\,\,\,{P_3} = \,\left\{ {4;\,\,8} \right\}.\)