Sec 192 of companies act 2013

Under section 192 of companies act 2013 relating to restriction on non-cash tranctions involving directors , can Prior approval in general meeting can be taken for both the cases i.e when director is seller or buyer or it can be taken just in 2nd case i.e when director is seller ? In the section clause i(b) mentions about prior approval in general meeting , there is not a seperate clause for approval in general meeting. I am confused , Kindly explain the same .