When magnetic tape was widely used for master files?
A. in the early 1960s
B. in the early 1950s
C. in the early 1850s
D. in the early 1860s
Answer:A
When magnetic tape was widely used for master files?
A. in the early 1960s B. in the early 1950s C. in the early 1850s D. in the early 1860s