nrf5340 ncs USB+DFU mcuboot_menuconfig

The MenuConfig page of SEGGER IDE (ncs1.9.1):

How should I configure this interface if I want to configure usb DFU and trigger upgrade mode via button: 1.boot_usb_dfu\Use gpio to detect whether to trigger dfu mode ,or   2.MCUBOOT_SERIAL\BOOT_SERIAL_DEVICE\BOOT_SERIAL_CDC_ACM  . Or check both of them. What's the difference between them? Because I think CDC ACM is a kind of USB. Do trigger GPIO need to be configured with the same pin?

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