Which of the following statement is incorrect?

Which of the following statement is incorrect?

C is the budget for the amount that the margin can be violated by the training data points. When C increases, the bias increases, which might lead to under$-$fit.

When data space is not separable by a hard linear boundary, a soft margin SVM is used with the budget C for errors.

C is the budget for the amount that the margin can be violated by the training data points. When C $=0,$ it does not allow any violation to the margin and turns into a hard$-$margin support vector machine.

C is the budget for the amount that the margin can be violated by the training data points. When C increases, the variance increases, which might lead to overfit.