If $A$ and $B$ are sets, then $A \cap (B -A)$ is
If $A$ and $B$ are sets, then $A \cap (B -A)$ is
- A
$\phi $
- B
$A$
- C
$B$
- D
None of these
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$A = \{ x:x$ is a natural number and multiple of $3\} $
$B = \{ x:x$ is a natural number less than $6\} $