Answer: A
Cross training
Step-by-step explanation:
Cross training involves teaching an employee the the skills required to execute the task he/she was employed for and also the skills required to perform a different job function. G4S is a security firm and the primary job function of its recruit will be protecting life but there might be case of an injured individual that need quick medical help, in such cases an employee is required to know basic first aid. Hence the need for cross training.