" Which technique for representing numeric data uses the mantissa to hold the significant digits of a value?"

signed magnitude

Explanation:

A numeric value that is approximate consists of a mantissa and an exponent. The mantissa is a signed numeric value, so also is the exponent a signed integer that specifies the magnitude of the mantissa.

answer; i believe the answer is tls,transport layer security;

well you didnt give us any options it looks like so im going to go with because cash cant be traced.