Question

complete the sentence. can cause malware such as a keylogger to be installed on a pc. injecting code opening an email with an infected attachment using a packet sniffer dumpster diving

Explanation:

Injecting code can directly introduce malicious code for malware installation. Opening an infected - attachment email can also trigger malware installation as the attachment may contain malicious scripts. A packet sniffer is mainly for monitoring network traffic and not a common way to install keyloggers. Dumpster diving is about retrieving information from discarded items and not related to installing malware on a PC. Opening an email with an infected attachment is a very common vector for malware installation including keyloggers.

Answer:

Opening an email with an infected attachment