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$P-$ type semiconductor is formed when
$A$. As impurity is mixed in $Si$
$B. Al$ impurity is mixed in $Si$
$C. B$ impurity is mixed in $Ge$
$D. P$ impurity is mixed in $Ge$

• A
  $A$ and $C$
• B
  $A$ and $D$
• ✓
  $B$ and $C$
• D
  $B$ and $D$