The cloudy areas on the edges of the plaque are due to
a. Lytic phage that are unable to enter the lytic lifecycle
b. Lysogens that contain prophage that prevent some of the phage from undergoing the lytic cycle
c. Lysogens that contain prophage that prevent some of the phage from undergoing the lysogenic life cycle
d. Lytic phage that are unable to enter the lysogenic lifecycle