rref(..) 5 -3 0 0 0 0 a. Select all of the true statements (there may be more than one correct answer). A. {a1, az, az, a } is a basis for R$ B.{az, az, az, ay} is a linearly independent set c. span{aj, az, az, as} = R$ D.{a, az} is a linearly independent set E. a, and a 2 are in the null space of A E span{a, a2} R3 G. {az, az, az, a4 } is not a basis for R3 OH.{a, az, az } is a linearly independent set b. If possible, write az as a linear combination of a, and az, otherwise, enter DNE. Enter a1 for a), etc. az = c. If possible, write a 4 as a linear combination of ai, az, and az; otherwise, enter DNE. a = d. The dimension of the column space of 4 is and the column space of 4 is a subspace of e. Find a basis for the column space of of A. Enter your answer as a comma separated list of vectors. Each vector should have the form or where a,b,... are numbers. Do not use the symbols ai, a2, ... in your answers. A basis for the column space of A is { } f. The dimension of the null space of A is and the null space of is a subspace of g. Find a basis for the null space of of A. Enter your answer as a comma separated list of vectors of the form or where a,b,... are numbers.