Which type of encryption is this application most likely to use to achieve this goal?

A packet is being sent from one computer to the next. This packet is being processed by an
application designed to encrypt sensitive data. One of the duties of this application is to ensure
that a packet has not been altered by an intruder. Which type of encryption is this application most
likely to use to achieve this goal?

A.
One-time pad

B.
Hash encryption