Jake gets a call from a user complaining about things seeming "squished" on the screen. Upon further review, Jake determines that the Edge browser on the user's laptop has a log of nonstandard toolbars taking up part of the screen, thus making it harder to see Web pages and images at agreeable sizes. What sort of malware has infected the user's computer?

a. Trojan horse

b. PUP

c. Ransomware

d. Worm