The correct answer is option 'c' - none.

Explanation:
HTML frames allow the division of a web page into multiple sections, where each section can display a different HTML document. The frame attribute is used to specify the position and behavior of a frame within a frameset. It can have various values, but "none" is not one of them.

Let's discuss each option and its relevance to the frame attribute:

a) above
The "above" value for the frame attribute is used to display the frame above the content. It creates a horizontal frame at the top of the frameset.

b) void
The "void" value for the frame attribute is used to create a frame without any content. This is commonly used when you want to create an empty frame for future use or dynamically load content into the frame using JavaScript.

c) none
The "none" value is not a valid value for the frame attribute. It is not recognized by HTML and does not have any specific meaning or behavior.

d) box
The "box" value for the frame attribute is used to create a frame with a border around it. It creates a rectangular box around the frame content.

In conclusion, the correct answer is option 'c' - none. It is not a valid value for the frame attribute in HTML.