In selecting a line coding technique, we consider the need for receive clock synchronization, as well as the frequency bandwidth occupied by the resulting signal. What is true about the Manchester line coding technique. a$.$ Manchester occupies less frequency spectrum $($i$.$e$.,$ frequency bandwidth$),$ than simpler line coding techniques such as NRZ b$.$ Manchester ensures signal transitions for each bit sent, thus helping to ensure receive clock synchronization; however, it occupies twice the frequency bandwidth compared to NRZ c$.$ Manchester ensures greater receive clock synchronization and efficient bandwidth usage compared to NRZ d$.$ there are no true statements listed above