What is the difference between MARSEC directives and voluntary increases or decreases in a vessel or facility security posture?
a) MARSEC directives are mandatory security measures imposed by regulatory authorities, while voluntary increases or decreases are optional security measures chosen by the vessel or facility.
b) MARSEC directives are optional security measures chosen by the vessel or facility, while voluntary increases or decreases are mandatory security measures imposed by regulatory authorities.
c) Both MARSEC directives and voluntary increases or decreases are mandatory security measures imposed by regulatory authorities.
d) Both MARSEC directives and voluntary increases or decreases are optional security measures chosen by the vessel or facility.