In multiclass classification number of classes must be

less than two
equals to two
greater than two
option 1 and option 2

The correct answer is C. greater than two.

Multiclass classification is a type of supervised machine learning in which the goal is to predict one of several possible classes for each input sample. The number of classes must be greater than two, because if there are only two classes, then the problem is a binary classification problem.

Option A is incorrect because the number of classes must be greater than two. Option B is incorrect because the number of classes must be greater than two. Option D is incorrect because option A and option B are both incorrect.