question_answer

For any two non empty sets P and Q, if \[P-Q=P\]and \[Q-P=Q,\]then ______

A)  \[(P\bigcup Q)'=\phi \]               

B)         \[P\bigcap Q=\phi \] 

C)  \[P\subset Q\]               

D)         \[Q\subset P\]

E)  None of these