What are primers?

• A. Primers are the short sequences at the end of the nucleotide sequences which are used for amplification
• B. Primers are the short sequences which are complementary to the nucleotides at the end of the sequence which is to be amplified
• C. Primers are the short sequences present anywhere in the nucleotide sequence to be amplified
• D. Primers are the short sequences which are complementary to the nucleotides anywhere in the sequence to be amplified