As an application of cryptography, digital Signatures and MACs can be used for. (1) Authentication
(2) Confidentiality
(3) Integrity
(4) Availability

Correct

(3) Integrity

Explanation:

Digital signature is a simple way of imprinting signature on a digital document. The aim could vary from showing that the document is coming from the right source to showing the integrity of the documents which was sent to the receiver.

The question revolves around Jonathan Swift's A Modest Proposal where Swift criticizes the English government in the lights of the poor lives of Irish people. He ironically proposes Irish can solve their food problems by selling their children. Swift lashed out to the economic policy of the government. However, he himself does not put any economical solution. He only just uses satire in order to convey the truth.