Question 2
The nullity of A is independent of the value of k.
The nullity of A depends on the value of k, and the set of all possible values forthe nullity of A is {1, 2}.
The nullity of A depends on the value of k, and the set of all possible values forthe nullity of A is {0, 1, 2, 3, 4, 5}.
The nullity of A depends on the value of k, and the set of all possible values forthe nullity of A is {2, 3}.