Layering another technology such as a "on top of the dial-up network connection can provide data security."

VPN(Virtual Private Network)

Explanation:

These are the options for the question;

PSTN

POTS

VPN

DSL

Data security can be regarded as ways in which Data, such as digital data in database is been protected from by unathorized access. It is a means to protect data's from cyber attack/ data breech and gives room for backup in case the original data is not accessible or lost. Some of the data security measures are;Data masking, data encryption tokenization and others.It should be noted that Layering another technology such as a VPN "on top of the dial-up network connection can provide data security."

VPN(Virtual Private Network) also provide data security when layered on

top of the dial-up network connection, it enables surfing website privately and in a secured manner, it hides the Internet Protocol (IP) of the user as well as the geographical location so that the the system will be freed from any form of cyber attack.