2. Suppose {v1, v2, v3, 4} is linearly independent. Using definitions, theorems, corollaries, and lemmas from section 3.4, argue whether the following sets form a basis for span{v1, v2, v3, 4}. Make sure to cite the particular theorem, etc., you used in your argument. (a) {v1, v2} (b) {v13, V2 + V4, V3, V4}