Which of the following is the correct security measure at the intersection of Integrity $-$ Storage $-$ Technology?

a$)$ Host intrusion system that alerts administrator when a critical file is modified

b$)$ Handbook on implementing a protocol that ensures data integrity

c$)$ An organization's awareness program on how to implement hard drive encryption on all laptops assigned to sales personnel

d$)$ Connection controls that prevents unauthorized users from accessing a Storage Area Network $($SAN$)$ system