Are the different conditions separately true i.e. should the answer be read in terms of “Either \[CapitalLambda] = 0” OR “[CapitalLambda] < 0 and also k >= 0 and k<=[CapitalLambda]”?
it is an OR. So it means any of these conditions must be true for the answer given to be valid.
A==0 || (A<=0 &&(k>=0 || k<=A)) mean A==0 on its own is sufficient condition, OR A<=0 AND any one of k>=0 OR k<=A
So if A<=0 AND k>=0 then this is a condition. Also if A<=0 AND k<=A then this is another condition. But if A<=0 and neither of K>=0 and k<=A are true, then the condition will fail. So check on the next OR from other ones. If any condition on its own is true, then it is sufficient.