which Stratum level does your NTP server report itself as?

An NTP server is configured to synchronize from three other NTP servers, all of which are Stratum
2 servers. By default, which Stratum level does your NTP server report itself as?

A.
Stratum 1

B.
Stratum 4

C.
Stratum 2

D.
Stratum 3

E.
Stratum 6