Mark each statement True or False. Justify each answer.
a. A linearly independent set in a subspace H is a basis for H.
b. If a finite set S of nonzero vectors spans a vector space V, then some subset of S is a basis for V.
c. A basis is a linearly independent set that is as large as possible.
d. The standard method for producing a spanning set for Nul A, sometimes fails to produce a basis for Nul A.
e. If B is an echelon form of a matrix A, then the pivot columns of B form a basis for Col A