The addition of unsymmetrical reagents to unsymmetrical alkenes occurs in such a way that the negative part of the addendum goes to that carbon atom of the double bond which carries lesser number of hydrogen atoms is called by

Question

$\begin{array}{1 1}(a)\;\text{Saytzeff rule}&(b)\;\text{Markownikoff's rule}\\(c)\;\text{Kharasch effect}&(d)\;\text{Anti-saytzeff rule}\end{array}$