Question $5$

Given the following circuit:

What function does it implement?

none of these

$(A+B{)}^{\text{'}}(BC{)}^{\text{'}}D$

$A^{\text{'}}{B}^{\text{'}}(B^{\text{'}}+C)D$

$(AB{)}^{\text{'}}(B+C{)}^{\text{'}}D$

$(A^{\text{'}}+B^{\text{'}})(B^{\text{'}}C)D$