question: combination lock:secrecy
choices.label: A B C D
choices.text: clock-in:attendance firewall:hacking monitor:camera instagram:mobile phone
explanation: the function of a "combination lock" is for "secrecy". the function of "colck-in" is to check on work "attendance". "firewall" has the function of protecting information security, not the function of "hacking". "monitor" has a monitoring function, not a "camera" function. "instagram" has the function of receiving and sharing information in real time, and the "instagram" software can be installed on a "mobile phone".