Given I don't know what Ctrl+Alt+C does, I'd best go for right-click Copy
(unless you meant just Ctrl+C - in which case I'll go for that option instead
)
On a similar vein - Copy, Cut, Paste: do you use...
Ctrl+Insert, Shift+Del and Shift+Insert (old skool), or Ctrl+C, Ctrl+X and Ctrl+V