Canopy Assistance
A and C.
No need for the complexity of compressed air. The Chippy has a small canopy assits panel that aids the pilot to slide back the lid at high speed.
I believe an issue in the Tutor v Glider mid-air was a potential delay in starting to abandon, due to the lack of the 'Jump, Johnnie, Jump' order to the unfortunate cadet, as his captain may not have survived the initial impact.