If an algorithm takes n^2 operations, and the computer can perform 100 billion operations per second, what is a reasonable estimate of how long it will take to sort 2 billion elements (assuming there is ample memory, the computer doesn't crash, etc.)? Selected answer will be automatically saved. For keyboard navigation, press up/down arrow keys to select an answer.

a 1 second

b 1 minute

c 1 hour

d 1 day

e 1 month

f 1 year

g 1 decade

h 1 century