Adigital signature is
a. created by hashing a document and then encrypting the hash with the signer's private key
b. created by hashing a document and then encrypting the hash with the signer's public key
c. created by hashing a document and then encrypting the hash with the signer's symmetric key
d. none of the above

A. created by hashing a document and then encrypting the hash with the signer's private key.

Explanation:

Digital signatures are created by the process of writing an encrypted message, which will represent the  signature of someone; it is also created another key that will be public. This is a very secure method, because any document will be encrypted with their private key , but someone will be able to open it if they have the public key corresponded to the signer's personal key.

no. when the asker posts the question they can make a question worth what ever they think is a fair price. although it must be within the limit of the points they currently own. 5 is the minimum number of points a question can be worth. if a question is complicated or has lots of parts to it, it is better to make it worth more because more people will be more willing to answer.

hope this !

this seems to be in the wrong category. but i'll take some free points my dude

posting this in wrong category will result in people seeing it who won't know the answer.