To answer this question, we need to understand the concept of a CheckBox and its states.
A CheckBox is a graphical user interface element that allows users to select or deselect an option. It typically has two states: checked and unchecked. When the CheckBox is checked, it indicates that the corresponding option is selected, and when it is unchecked, it indicates that the option is not selected.
However, in some cases, a CheckBox can have three states instead of two. This third state is often referred to as the "indeterminate" state. The indeterminate state is used when the CheckBox represents a group of options, and some of the options are selected while others are not. In this state, the CheckBox appears as a filled square or a square with a horizontal line.
Therefore, the correct answer is C) 3.