Final answer:
GOOD Shelter staff should be identifiable with an approved identification method, with a uniform badge being the most suitable choice among the options provided.
Step-by-step explanation:
The question relates to identifying staff members on duty at a facility. Staff members at the GOOD Shelter should be readily identifiable while on duty by means of an approved identification. The given options are QR code, facial recognition, uniform badge, and secret handshake. The most appropriate and conventional method for staff identification among the listed options is using a uniform badge because it is visible and accessible to everyone, unlike the other options that are more suitable for technology-driven or confidential identification purposes.