The whitelist + blacklist mode is adopted in terminal security management. Which of the following are normal behaviors?

The whitelist + blacklist mode is adopted in terminal security management. Which of the following are normal behaviors?
A . The terminal host does not have the software in the whitelist installed, nor the software in the blacklist.
B. The terminal host installs all the software in the white list, but does not install the software in the black list.
C. Some software in the whitelist is installed on the terminal host, but the software in the blacklist is not installed.
D. The terminal host installs all the software of the whitelist terminal, and installs some software in the blacklist.

Answer: B