Consider the following statements regarding Ganga River System:
1. Ganga originates as Bhagirathi, further it meets Alakananda at Devaprayaga.
2. Gomati is the second longest tributary of Ganga.
3. Sind originates in the Vidisha plateau of M.P and joins Yamuna.
4. Son River joins Ganga at Danapur in Patna district.
Which of the above statements are correct?