mobile device user installed several free apps that randomly present an advertisement. Recently, multiple advertisements are showing and dominating the screen even when none of the free apps are running.Which of the following is the most likely cause for the increase in advertisements?
a. The device is infected with malware.
b. The free apps need to be updated.
c. The cellular service is sending the advertisements.
d. The anti-malware app on the device is misbehaving.
Answer: a. The device is infected with malware.