Major component of Cymbopogon citratus is citral which is utilized commercially for the synthesis od vitamin A from the following: [P]: Directly from citral [Q]: By first converting to T-ionone [R]: By first converting to T-ionone followed by conversion to a-ionone which is very important intermediate for carotenoid synthesis [S]: By first conversion of citral to T-ionone followed by conversion to P-ionone which is an important intermediate for carotenoid synthesis Which is the correct combination of options?