Answer:
you need to give context of the situation
Md command, (make directory) creates a directory. It's a subdirectory when you md under a directory.
local stores in neighborhood do not have computerized cash registers but they may have cameras if they are in a bad neighborhood. inventory is controlled by checking the shelves.
the Qs about computers, servers and clients are for national chain stores. they use clients at each store which are connected to the central servers at HQ. employees need special training as the system is complicated. the whole system is maintained by their IT department.
Answer: I cant give you an exact answer, but your options are gonna be B or C.
Explanation: A computer programmer actually doesn't work with a marketing company at all, most of them work from home as it is. And a Tech Support Specialist may work with a marketing firm, but it would be strictly IT stuffs.