Why there is a start (*) after Nodegroup:0 in MySQL cluster? What does it means?

Question

I am new to MySQL and MySQL cluster setup. However going through several blogs and Web links I've finally able to manage the cluster up and running. I have 1 management, 1 SQL and 3 data nodes (currently without any replicated SQL or data nodes as I have set NoOfReplicas=1 in the config.ini file). After running ndb_mgm> show I can see there is a start just after the first data node, what does it means? I searched over google but didn't find any proper answer. Kindly help.

ndb_mgm> show

Cluster Configuration

[ndbd(NDB)] 3 node(s)

id=3 @10.10.10.3 (mysql-5.5.34 ndb-7.2.14, Nodegroup: 0, *)

id=4 @10.10.10.4 (mysql-5.5.34 ndb-7.2.14, Nodegroup: 1)

id=5 @10.10.10.5 (mysql-5.5.34 ndb-7.2.14, Nodegroup: 2)

[ndb_mgmd(MGM)] 1 node(s)

id=1 @10.10.10.1 (mysql-5.5.34 ndb-7.2.14)

[mysqld(API)] 1 node(s)

id=6 @10.10.10.6 (mysql-5.5.34 ndb-7.2.14)

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