A penetration tester has been contracted to conduct a physical assessment of a site. Which of the following is the MOST plausible method of social engineering to be conducted during this engagement?

Randomly calling customer employees and posing as a help desk technician requiring user password to resolve issues

Posing as a copier service technician and indicating the equipment had “phoned home” to alert the technician for a service call

Simulating an illness while at a client location for a sales call and then recovering once listening devices are installed

Obtaining fake government credentials and impersonating law enforcement to gain access to a company facility