Which Is NOT True of Gradient Boosting Machine (GBM) Models

Multiple Choice

Which is NOT true of gradient boosting machine (GBM) models?

A) GBM can be implemented under the "caret" package.
B) Decision trees and random forests can be base learning methods under GBM.
C) OLS regression can be a base learner model under GBM.
D) The GBM solution is attained in an iterative process weighting cases differentially, with gradual shifts between solutions.
E) All of the above are true.