What are hashes?

Question $6$ options:

a$)$

Ensures programs load correctly

b$)$

a one$-$way function that compiles streams of data into a message digest

c$)$

Checks the correctness of a program

d$)$

a variable key$-$size stream cipher with byte$-$oriented operations. The algorithm is based on the use of a random permutation

Question $2$ options:

a$)$

To come into possession of property

b$)$

The purchase of one company by another

c$)$

Restoring from a backup

d$)$

Making a bit by bit copy