Which statements are true about Cisco IOS and the router boot process? $($Choose $2)$

$31.$ Modern routers load the IOS into RAM during the boot process, and run the IOS from RAM during normal operation.

$32.$ A router can be configured to load its IOS from a TFTP server during the boot process.

$33.$ The IOS is always stored in Flash memory and loaded from there.

$34.$ A complete copy of the IOS is held in ROM and can be loaded from there.

$35.$ A backup copy of the IOS is often held in NVRAM in case the main file is lost.