The following elements comprise a portion of what services?
Digital certification
Certification authority
Timestamping
Lightweight Directory Access Protocol (LDAP)
Non-repudiation support

A.
Public Key Infrastructure (PKI)

B.
Wireless Application Protocol (WAP)

C.
IPSec

D.
Transaction Layer Security (TLS)

Explanation:
The correct answer is PKI, which describes the integration of
digital certificates, digital signatures, and other services necessary to
support e-commerce. The other answers are distracters.