What is the default sequence in which a router searches…

What is the default sequence in which a router searches for the Internetwork Operating System (IOS) image
upon power on?

A.
TFTP, Flash, ROM

B.
ROM, Flash, TFTP

C.
Flash, TFTP, ROM

D.
Flash, TFTP, NVRAM

E.
NVRAM, Flash, TFTP

Explanation:
The default sequence in which a router searches for the IOS image is in Flash memory, on a Trivial File
Transfer Protocol (TFTP) server, and in read-only memory (ROM). The router will first search for the IOS image
in the Flash memory. If there is no image in the Flash, the router will try to contact a TFTP server. If the router
cannot find the IOS image on the TFTP server, it will load a limited version from the ROM.
The sequence that begins with TFTP and the sequence that begins with ROM are both incorrect sequences
because the router will begin searching for the IOS image in Flash memory.
The sequences that include Non-volatile random access memory (NVRAM) are both incorrect because a router
does not store the IOS image in NVRAM. The startup configuration is stored in NVRAM.
Objective:
Infrastructure Management
Sub-Objective:
Perform device maintenance

Cisco > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.4 > Part 9: Loading and
Maintaining System Images > Specifying the Startup System Image in the Configuration File