The difference of perimeter and diameter of a circle is X unit. The diameter of the circle is

• A. <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>X</center></td><td rowspan="2">unit</td></tr><tr><td style="text-align: center;"> - 1</td></tr></table>
• B.
• C. <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>X</center></td><td rowspan="2">unit</td></tr><tr><td style="text-align: center;"> + 1</td></tr></table>
• D. <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>X</center></td><td rowspan="2">unit</td></tr><tr><td style="text-align: center;"> </td></tr></table>
• E. <table><tr><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-oparen-h1.gif"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>X</center></td><td rowspan="2"> - 1</td><td rowspan="2"><img src="https://www.indiabix.com/_files/images/data-interpretation/common/15-sym-cparen-h1.gif"></td><td rowspan="2">units</td></tr><tr><td style="text-align: center;"> - 1</td></tr></table>