not sure how to answer this question

Question 5 Let A be the matrix Tries remaining: 1 -9 Marked out -15 WUNL of 6.00 -27 81 F Remove 13 -39 flag (a) What is a basis of the column space of A? In your answer below, if a vector is not needed, enter 99,98,97,96 in each of its entries and put all such vectors after the basis vectors. 98 -2 -8 97 3 96 Correct answer, well done. (b) What is a basis of the row space of A? In your answer below, if a vector is not needed, enter 99,98,97,96 in each of its entries and put all such vectors after the basis vectors. -1 3 -9 0 2 5 -15 3 -27 81 -8 99 97 96 Correct answer, well done. (c) What is a basis of the null space of A? In your answer below, if a vector is not needed, enter 99,98,97,96 in each of its entries and put all such vectors after the basis vectors. 99 98 O 97 96 Incorrect