Your company has hired a contractor to build fences surrounding the office building perimeter and install signs that say "premises under $24-$hour video surveillance." When do these controls occur?

Question $32$ options:

a$)$

The fence and the signs should both be installed before an attack

b$)$

The fence and the signs should both be installed after an attack

c$)$

The fence should be built after an attack, and the signs installed before an attack

d$)$

The fence should be built before an attack, and the signs erected after an attack