Itc under gst

Could you please guide us,  for the following cases RCM applicability and ITC eligibiligy:

a.   If a company engage manpower resources,  the manpower provider ( unregistered & registered )give bills 

b.   If a company provide subsidized food to its employees,   caterers( unregistered & registered ) gives the bills.

c.   If a company provide pick up cap to its employees,   if Registered transporter provide bills