In diapsid skull of reptiles, the two temporal fossae are separated by these bones to form the upper temporal bar :

Question

$\begin {array} {1 1} (1)\;Post-orbital\: and \: squamosal & \quad (2)\;Squamosal\: and\:  jugal \\ (3)\;Post-orbital\:  and \: jugal & \quad (4)\;Post-frontal \: and\: squamosal \end {array}$