Complete the following text using the most appropriate words and phrases that are provided below.

is a term used to describe any destructive computer program. It covers many different types of program; including: $-$ destructive programs pretending to be useful applications; Blank $3$ Question $37-$ dangerous software attached to legitimate programs, these are described as Blank $4$ Question $37$ since they can make copies of themselves in order to spread. Blank $5$ Question $37$ are another type of destructive program which spread rapidly through Blank $6$ Question $37.$ A recent type of dangerous software is Blank $7$ Question $37$ where a user$$s files are encrypted and made inaccessible.