What Is a Defective Phage

What is a defective phage?

A) A virus that has lost some of its genetic material, and therefore cannot infect a new target cell.
B) A virus that has lost some of its genetic material, and therefore cannot replicate within a new target cell.
C) A virus that lacks the ability to replicate independently of its host cell and cannot survive.
D) A virus that cannot attach to its host cell and therefore cannot enter the target cell.
E) A virus that lacks a prophage, cannot enter a host cell, and cannot survive.