Ariane 6 concepts under investigation

The Ariane 6 is a three-stages configuration (called PPH) powered by solid propulsion for the lower composite (first two stages) and with a cryogenic liquid oxygen and hydrogen for the upper stage.
For the lower composite, several options are being considered in terms of number, loading and arrangement of motors.
For the upper stage, Ariane 6, similarly to Ariane 5 ME Adapted, will use cryogenic propulsion for the upper stage based on the Vinci engine. It will be restartable and have direct deorbiting features.