Final answer:
The job role involving the support of SIGINT activities and monitoring non-communications electronic signals with passive receiving equipment is SIGINT Operator (D).
Step-by-step explanation:
The answer to the question about which job role involves supporting SIGINT activities and operations by monitoring and collecting non-communications electronic signal transmissions using passive receiving equipment is D) SIGINT Operator. SIGINT, which stands for Signals Intelligence, operates within the intelligence community and the military to intercept and analyze electronic signals that are not used for communication purposes, such as radar emissions or other electronic signals. A SIGINT Operator is responsible for this task as part of their duties, which are crucial for national security and intelligence gathering efforts.
A Radiologist is a medical professional who interprets medical images, a Bartender is a person who mixes and serves drinks at a bar, and an Electrician is a tradesman who installs and maintains electrical systems, none of which are related to SIGINT operations.