An organization$$s threat team is creating a model based on a number of incidents in which systems in an air$-$gapped location are compromised. Physical access to the location and logical access to the systems are limited to administrators and select, approved, on$-$site company employees. Which of the following is the BEST strategy to reduce the risks of data exposure?

$2$

$/$

$2$

A$.$ Mandatory access control

B$.$ NDAs

C$.$ Security awareness training

D$.$ NIPS