An internet-based attack using password sniffing can:

A. enable one party to act as if they are another party.

B. cause modification to the contents of certain transactions.

C. be used to gain access to systems containing proprietary information.

D. result in major problems with billing systems and transaction processing agreements.

Explanation:

Password sniffing attacks can be used to gain access to systems on which proprietary information is stored. Spoofing attacks can be used to enable one party to act as if they are another party. Data modification attacks can be used to modify the contents of certain transactions. Repudiation of transactions can cause major problems with billing systems and transaction processing agreements.