Gretchen wants to avoid

Can someone work out the answer as it comes up in one of my computer science exams and i don't understand the cryptovariables

How does the use of e-mail benefit business communications? it can be sent at any time. it is faster than regular mail. it improves writing skills. it is less expensive than using a courier. it reduces the need for proofreading.

How can u permanently delete a picture from your camera ?