Mark the correct alternative regarding the outputs of an artificial neural network for classification problems in one-hot-encoding.

A. It is represented by a vector of k positions, which k represents the number of nodes in the input layer.

B. It is represented by a vector with a dimension equivalent to the number of classes, in which the value whose index is equivalent to the prediction receives the value 1, while the other values receive the value 0.

C. It is represented by a vector of dimension equivalent to the number of classes, in which each present value can assume the value of -1, 0 or 1.

D. None of the alternatives.

E. It is represented by a matrix of dimensions equivalent to the number of training samples and the number of attributes.