Answer: URN(Uniform Resource Name) is the basically a subset of the Uniform Resource identifier(URL). It uses "urn"scheme for the working an implementation. Uniform resource name functions by identifying components uniquely through their name.
The most common example of URN is ISBN (International Standard Book Number)number which helps in the unique searching and identification of book.
The keyboard shortcut used to copy data from a cell is A.) Ctrl + c command +C
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Radio buttons exist like selection lists in which they limit fields to a set of potential values; but, unlike selection lists, the options appear as respective controls in the web form.
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What is Radio button?</h3>
A radio button or option button exists as a graphical control element that permits the user to select only one of a predefined set of mutually exclusive options. The singular property of a radio button causes it distinct from checkboxes, where the user can select and unselect any numeral of items.
Radio buttons exist as a common way to permit users to make a single selection from a list of options. Since only one radio button can be selected at a period (within the same group), each available option must be its item and label. Radio buttons exist like selection lists in which they limit fields to a set of potential values; but, unlike selection lists, the options appear as respective controls in the web form.
To learn more about Radio button refer to:
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