"start %comspec% /c script.cmd" vs "start cmd /C script.cmd"

Question

What is the difference between following commands:

start %comspec% /c script.cmd
start cmd /C script.cmd

I need that cmd window for script.cmd should close automatically when script.cmd is finished.

Answer 1

%comspec% just points to cmd.exe, so both commands will do the same thing. Other than that /C is correct, this will close the command prompt after execution