You have configured accessibility options for Tom. Everything works fine. You want to configure that when Tom wants to use CTRL， ALT or Shift key simultaneously， he should has the option to press one key at a time？ What should you do to provide this feature to Tom？（）

• A、Turn on FilterKeys, this will allow accessibility options to be turned on at will.
• B、In accessibility options on the general tab, enable "turn off accessibility features after idle for  xx minutes".
• C、From the Keyboard tab of the accessibility option applet, check the StickyKeys checkbox, this  will save all accessibility options when you exit the control panel applet.
• D、In accessibility options on the general tab, disable "turn off accessibility features after idle for  xx minutes".