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The Boolean expression $Y=\bar{A} \bar{B} \bar{C} D+\bar{A} B C \bar{D}+A \bar{B} \bar{C} D+A B \bar{C} \bar{D}$ can be minimized to

1. $Y=\bar{A} \bar{B} \bar{C} D+\bar{A} B \bar{C}+A \bar{C} D$
2. $Y=\bar{A} \bar{B} \bar{C} D+B C \bar{D}+A \bar{B} \bar{C} D$
3. $Y=\bar{A} B C \bar{D}+\bar{B} \bar{C} D+A \bar{B} \bar{C} D$
4. $Y=\bar{A} B C \bar{D}+\bar{B} \bar{C} D+A B \bar{C} \bar{D}$