If you don’t want the frame windows to be resizeable, simply add what to the <frame>lines ?a. Saveb. dontresizec. resized. sizee. Noresize

To prevent frame windows from being resizable in HTML, you'll want to use the noresize attribute within the <frame> tag. This attribute is part of the deprecated frameset HTML specification, and when included, it specifies that the user should not be able to resize the frame.

Here's a brief explanation of the options provided:

1. Save - Not relevant to frame resizability.
2. dontresize - Not a standard HTML attribute and will not function as intended.
3. resized - Incorrect, as there is no valid attribute for this.
4. size - While it relates to dimensions, it doesn't control resizability.
5. Noresize - Correct choice; it restricts the frame from being resizeable.

In summary, to restrict resizing of a frame in HTML, the correct approach is to use the noresize attribute.

Final Answer

Use the attribute noresize within the <frame> tag.