Which of the following isotopes of carbon is/are used in carbon dating? [CDS]

• A. \[_{6}{{C}^{12}}\] only
• B. \[_{6}{{C}^{13}}\] only
• C. \[_{6}{{C}^{14}}\] only
• D. \[_{6}{{C}^{12}}\] and \[_{6}{{C}^{14}}\]