How did Katherine contribute to John Glenn's mission into space? help me and do not say hi until you answer my question

a She programmed the computer that calculated the path Glenn's spacecraft had to take.

b She helped accurately predict where Glenn's spaceship would land after orbiting Earth.

c She computed the path that Glenn's spacecraft would take on its way to the moon and back.

d She developed a new type of math to determine the speed of Glenn's spacecraft in zero gravity.