One of the Reasons That PCR Is Useful in Diagnosis

One of the reasons that PCR is useful in diagnosis of HIV is because it

A) detects antibodies against the virus.
B) interferes with viral replication,causing the virus to become latent.
C) automatically determines the sequence,as well as the presence of the viral genome.
D) detects an infection at an earlier stage than the current standard test.
E) detects both viral DNA and viral proteins.