Why do cryptologists recommend changing the encryption key from time to time? Is it the same reason security experts recommend changing a password from time to time? How can one determine how frequently to change keys or passwords?

the answer would be d. online forums.

hope it

professionals can use many types of technology that can them. some examples are, computers (they research and can use for programs for data, they are also used for job applications, school work, and even to make new ideas), speedometers (can get data for unknown data), sometimes something as small as a pen (used for rough drafts, to insert data, and again job applications).