Which of the following statements are true regarding the KCC in a site with multiple DCs$?$ Select three.

a$.$

The KCC ensures replication starts $15$ seconds after an AD update is detected

b$.$

KCCs use data stored in the domain$-$wide configuration directory partition

c$.$

The KCC creates connection objects to establish replication partnerships

d$.$

The KCCs on each domain controller do not communicate with one another

e$.$

The KCC recalculates the replication topology every $15$ minutes by default