Final answer:
The question asks about the column width of a div in Bootstrap 3's grid system on a large (lg) viewport. Without the exact class provided, we cannot determine the specific number of columns. Generally, in Bootstrap 3, a class such as col-lg-x would make the div x columns wide on a large viewport.
Step-by-step explanation:
The question pertains to Bootstrap 3's grid system. In the Bootstrap 3 framework, when talking about an lg viewport, which stands for 'large' viewport, the class prefix used is col-lg-. This is followed by a number that indicates how many columns wide the <div> will be out of a possible 12 columns in the grid system.
Without the specific class mentioned in the code snippet, we cannot determine the exact number of columns the div would span on an lg viewport. If you provide more details like col-lg-6, we could say it would be 6 columns wide. In general, the class col-lg-x tells you that on large screens, the div will take up 'x' number of columns, where 'x' is a number between 1 and 12.