Choose the correct options for the following questions.
$A\cap B =B$ is only true, when
Difficulty: Easy
A:
$A\subseteq B$
B:
$A=\phi$
C:
$B\subseteq A$
D:
None of the above
$A-B=A$ is only true, when
Difficulty: Easy
A:
$A=\phi$
B:
If $A$ and $B$ are equal
C:
$A$ and $B$ are disjoint set
D:
None of the above
$A'=\phi$ condition is only true, when
Difficulty: Easy
A:
$U=\phi$
B:
$U=A$
C:
$A=\phi$
D:
$A'=U$
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