DNA Polymerase Requires a 3' OH Group Provided by a Primer

Multiple Choice

DNA polymerase requires a 3' OH group provided by a primer before it can begin DNA synthesis.How is it that the primer can be synthesized on the DNA without a 3' OH group?

A) The primer is RNA-synthesized by RNA polymerase,which does not require a 3' OH group.
B) These primers require an even shorter primer sequence.
C) The primer uses an artificial 3' OH group provided by a unique enzyme.
D) Primers use a 5' OH group.