An attack where the attacker captures a portion of a communication between two parties and retransmits it at another time is called a attack.

replay

Explanation:

Based on the information provided within the question it can be said that this scenario is describing an attack known as a replay attack. This term refers to an attack in which a the data transmitted during the attack is maliciously repeated in different time periods. This is done in order to continuously attack the system.

the correct answer is: a.)it is never appropriate to use acronyms and emoticons in business communication.