If xy+4z = x(y+z), which of the following must be true?	Choose the correct choice from the following choices:
A) 1. x=0 and z=0  B) 2. x=1 and y=1  C) 3. y=1 and z=0  D) 4. x=1 or y=0  E) 5. x=4 or z=0
xy+4z=x(y+z)   xy+4z=xy+xz   4z=xz   it means x=4 or z=0   Answer 5. x=4 or z=0
<result>E</result>
If xy+4z = x(y+z), which of the following must be true?