John the security administrator at Certkiller Inc. is working on securing the network with strong passwords. What is the definition of a strong password?

A.
The definition of a strong password is at least ten characters long and should contain cryptographic characters.

B.
The definition of a strong password is at least eight characters long;contains uppercase letters, lowercase letters, numbers, and should not contain special characters.

C.
The definition of a strong password is defined by each company depending on the product being used.

D.
The definition of a strong password is at least eight characters long;contains uppercase letters, lowercase letters, numbers, and special characters.

Explanation:

Passwords should be at least eight characters long and contain uppercase letters, lowercase
letters, numbers, and special characters (#, %, $, and so forth).
Reference: Safe white papers; page 67
SAFE: Extending the Security Blueprint to Small, Midsize, and Remote-User Networks