Question

a worm is spread using
a. email
b. saved documents
c. the operating system
d. malware

Explanation:

A worm is a type of malware, but it spreads on its own, often via networks or operating system vulnerabilities. However, among the options, worms are commonly spread through email (as a form of malicious code attachment or link in emails). Saved documents don't typically spread worms, the operating system is not a spreading method (worms exploit OS vulnerabilities to spread), and malware is the category of the worm itself, not the spreading method. So the correct option is a. email.

Answer:

a. email