Which of the following is not a priority rule for R, S-Configuration?

• A. If the four atoms attached to the chiral centre are all different, priority depends on atomic number, with the atom of lower atomic numbers getting lower priority
• B. If the two atoms attached to chiral centre are same, the atoms attached to each of these first atoms are compared
• C. When there is a double bond or triple bond, both atoms are considered to be duplicated or triplicated
• D. If the four atoms attached to the chiral centre are all different, priority depends on atomic number, with the atom of higher atomic numbers getting lower priority