Situation 1: person A works under a photography company ABC as a photographer/second photographer/assistant, when photos are sent to clients, do client need to credit person A AND company ABC, or ONLY company ABC, or they do not need to credit as all as they paid for the photos

Situation 2: person A voluntarily helps person B/company ABC as second photographer/assistant, does client need to credit person A, or only person B/company ABC

take note that situation 1 involves someone who is officially working under a company, and situation 2 is when someone is only shadowing a photographer or helping as a second photographer

Does person A’s photos automatically becomes company ABC’s photos when he/she works as a second photographer under them? Can company ABC send person A’s photos to client as their own photos?