27 10 -7 -8 -33 10 4 -2 -3 -12 1. Suppose A = -6 -2 2 2 8 3 1 -1 (a) What are the dimensions of the four fundamental subspaces of A? (b) Find a martix W whose columns form a basis for R4, and whose first few columns are a basis for the column space of A