Which of the following is an appropriate response to a caller stating she saw a man walking down the hallway, holding what appeared to be a rifle in a gun case 20 minutes ago

A) Advise the caller to immediately confront the individual to gather more information.
B) Instruct the caller to follow the person discreetly while providing real-time updates.
C) Ask the caller to safely observe from a distance and provide a detailed description.
D) Disregard the information as it happened 20 minutes ago and may no longer be relevant.