For the Gaussian Mixture Model, which statement is not correct about variable?Options:$*$ The hidden variable refers to an unobservable or latent variable introduced to model the underlying structure of the data.$*$ The hidden variable typically represents the cluster assignment of each data point.C$.$The hidden variable is estimated using the EM algorithm.D$.$ The hidden variable can be collected in the data collection step if it is important, we did not collect such information in the data, so the hidden variable is not important.