What is meant by the phrase "backing up your data"? select one of the options below as your
a. downloading and installing software updates when prompted to do so
b. examining the disk for unnecessary files and permanently deleting them
c. making a duplicate copy of the data and storing it in another location

only #2 represents an object at rest on a table.

in #1, there is no normal force due to the table; the object is accelerating downward.

in #3, the vertical forces are not balanced; the object is accelerating downward.

in #4, neither the vertical nor the horizontal forces are balanced. the object is accelerating upwards and to the right.