A Herpes Virus Causes Both Chicken Pox and Shingles in Humans

A herpes virus causes both chicken pox and shingles in humans. People who have had chicken pox may be afflicted with shingles much later in life. What is a likely explanation for this?

A) The intact virus was harbored within cells and was activated.
B) The viral DNA had been incorporated into the host's genome and was induced to enter the lytic cycle.
C) The viral DNA became active while integrated into the host's DNA.
D) Expression of host DNA genes was shut down.
E) All of the above