Which of the following property defines whether table cell borders are connected or separate?

The correct answer is: C. border-collapse

The border-collapse property defines how the borders of table cells collapse when they meet. The possible values are:

• separate: The borders of adjacent cells are separated by a space.
• collapse: The borders of adjacent cells are merged into a single border.
• inherit: The value of the border-collapse property on the parent element is inherited.

The border-table property is not a valid CSS property.

The border property is used to specify the width, style, and color of the border

The border-collapse property is more specific than the border property, so it will override the border property if both properties are used.