Solution

The correct answer is BD + B'D'

Key Points

• An pairs is a group of two adjacent 1's. An pairs reduces one variable from a Boolean equation.
•  An quads is a group of four adjacent 1's. An quads reduces two variable from a Boolean equation.
•  An octet is a group of eight adjacent 1's. An octet reduces three variable from a Boolean equation.

After simplification ​BD + B'D'