Which of the following security controls is a set of layered security services that address communications and data security problems in the emerging Internet and intranet application space

Which of the following security controls is a set of layered security services that address communications and data security problems in the emerging Internet and intranet application space
A . Internet Protocol Security (IPSec)
B . Common data security architecture (CDSA)
C . File encryptors
D . Application program interface (API)

Answer: B