A security analyst is reviewing the following log from an email security service. 

Which of the following BEST describes the reason why the email was blocked? 

Answer options:

A. The To address is invalid.
B. The email originated from the www.spamfilter.org URL.
C. The IP address and the remote server name are the same.
D. The IP address was blacklisted.
E. The From address is invalid.

D

Reference: https://www.webopedia.com/TERM/R/RBL.html