What command can be used on an existing (formatted) partition, to configure the interval between
disk checks when mounting partitions?

A.
mke2fs

B.
e2fsck

C.
e2fsckconfig

D.
config2fs

E.
tune2fs

Explanation:
From the man pages:
tune2fs – adjust tunable filesystem parameters on ext2/ext3/ext4 filesystems
-i interval-between-checks[d|m|w] Adjust the maximal time between two filesystem checks. No
suffix or d will interpret the number interval-between-checks as days, m as months, and w as weeks.
A value of zero will disable the time-dependent checking.