What is the preferred method to improve neighbor loss detection in EIGRP?

What is the preferred method to improve neighbor loss detection in EIGRP?

A.
EIGRP natively detects neighbor down immediately, and no additional feature or configuration
is required.

B.
BFD should be used on interfaces that support it for rapid neighbor loss detection.

C.
Fast hellos (subsecond) are preferred for EIGRP, so that it learns rapidly through its own
mechanisms.

D.
Fast hellos (one-second hellos) are preferred for EIGRP, so that it learns rapidly through its
own mechanisms.