Identify the Letter of the Choice That Best Matches the Phrase

Identify the letter of the choice that best matches the phrase or definition.
-Most systems require that a user selects this on his or her own.

A) digital signature
B) digital certificate
C) CA
D) digital security risk
E) firewall
F) botnet
G) zombie
H) clickjacking
I) Digital Millennium Copyright Act (DCMA)
J) DoS attack
K) AUP
L) iris recognition system
M) web filtering software
N) password
O) script kiddie
P) ciphertext
Q) plaintext
R) bot
S) piracy
T) copyright