employment verification

#1
Hi, I have worked in 3 companies previously. Will CO do the verification in all of the previous companies? Which one is preferred nowadays? Most recent or past employer? Regards,
#2
CO can request for verification from all the three companies, or may be only the latest or maybe none.. have you claimed points for all the employments?
#3
yes. I have claimed points for all of them.
#4
yes. I have claimed points for all of them.