In terms of security culture, what needs to be carried out as an integral part of security by all members of an organisation and is an essential component to any security regime?

In terms of security culture, what needs to be carried out as an integral part of security by all members of an organisation and is an essential component to any security regime?
A . The ‘need to knownprinciple.
B . Verification of visitor’s ID
C . Appropriate behaviours.
D . Access denial measures

Answer: D