What must be done to address this issue?

An administrator is configuring RADIUS on a Cisco switch with a key set to Cisc407294634 but is receiving the error “Authentication failed: 22040 Wrong password or invalid shared secret.” What must be done to address this issue?
A. Add the network device as a NAD inside Cisco ISE using the existing key.
B. Configure the key on the Cisco ISE instead of the Cisco switch.
C. Validate that the key is correct on both the Cisco switch as well as Cisco ISE.
D. Use a key that is between eight and ten characters.