A Technologist in a Tissue Bank Who Performed HLA Typing

A technologist in a tissue bank who performed HLA typing by DNA analysis was asked to bank all DNA extracted from specimens received in the laboratory so as to maintain the nucleic acid for the longest period in the most limited space. How should the DNA be stored to satisfy this request?

A) Freeze-dried at 22^o-25^oC
B) DNase-free water at 22^o-25^oC
C) TE buffer at 2^o-8^oC
D) DNase-free water at -70^oC