What is a valid keystroke usage when working with an existing PCF file? $1)$ Use ALT $+$ SHIFT $+$ E from the browser to start Studio if it is not already running and open the PCF that was used to render the page. $2)$ Use ALT $+$ SHIFT $+$ W from the browser to open the PCF in Studio. $3)$ Use ALT $+$ SHIFT $+$ I from the browser to see the list of PCFs used to render the page. $4)$ Use ALT $+$ SHIFT $+$ L from Studio to reload changes to PCFs$.$