Seth is using a technique known as hybridization. What is Seth MOST likely doing?

A.
He is binding together strands of DNA with a complementary DNA sequence.
B.
He is placing DNA samples in a DNA thermal cycler to create a copy of the DNA.
C.
He is practicing a method known as Polymerase Chain Reaction (PCR).
D.
He is using a method that is involved in Short Tandem Repeat (STR) technology.

A. He is binding together strands of DNA with a complementary DNA sequence.