Which of the following property specifies the size of the mask?

The correct answer is: D. none of the mentioned

• box-sizing is a CSS property that specifies how the width and height of an element are calculated. It can have the values border-box, content-box, or padding-box.
• box-shadow is a CSS property that creates a shadow effect around an element. It takes four values: horizontal offset, vertical offset, blur radius, and color.
• box-reflect is a CSS property that creates a reflection effect on an
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  element. It takes two values: x-offset and y-offset.

None of these properties specify the size of the mask. The size of the mask is specified by the mask-size property. The mask-size property takes two values: width and height.

For example, the following CSS code will create a mask that is 100px wide and 100px high:

css
.mask {
width: 100px;
height: 100px;
}