Identify the Letter of the Choice That Best Matches the Phrase

Identify the letter of the choice that best matches the phrase or definition.
-A notice that guarantees a user or a website is legitimate.

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