Ransomware is a scam in which a perpetrator $\_\_\_\_\_\_.$

a$.$

pretends to be a legitimate social media user in order to create a relationship with a user

b$.$

encrypts your data and files or restricts access, unless you pay the perpetrator

c$.$

creates an app that pretends to be an antivirus app, but actually infects a device with malware

d$.$

sends an official$-$looking message that attempts to obtain your personal and$/$or financial information