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In Boolean algebra $A.B=Y$ implies the :

• A
  Product of $A$ and $B$ is $Y$
• B
  $Y$ exists when $A$ exists or $B$ exists
• ✓
  $Y$ exists when both $A$ and $B$ exist but not when only $A$ or $B$ exists
• D
  $Y$ exists when $A$ or $B$ exists but not both $A$ and $B$ exist.