b. To act jointly and severally

If attorneys are acting “jointly and severally”, it means that they can act together, but can also act separately if they wish. This would effectively mean that any one of the attorneys will be able to make a decision by themselves. One obvious advantage is of course that there will be more flexibility for any one attorney to exercise his/her power; and the disadvantage is that it may be easier for any one attorney to abuse his/her power.