What is the best way to mitigate Browser Helper Objects (BHO) from being installed on your system?

A.
A BHO is certificate protected and therefore safe to install on your system.

B.
A BHO is easily protected using default anti-virus or IPS signatures.

C.
A BHO installation can be stopped using CSA rules.

D.
Disable BHOs in your browser’s preferences.

E.
A BHO is not a security concern.