Long-Term Storage (>1 Year) of Stock Aerobic and Anaerobic Bacteria

Long-term storage (>1 year) of stock aerobic and anaerobic bacteria can be accomplished by

A) subculture onto trypticase soy agar (TSA) slants.
B) freezing at 70° C.
C) storing them on blood agar plates at 37° C.
D) All of the above are correct.