Siddaramaiah refuses to go to Rajya Sabha - What are his options?

Karnataka politics: Siddaramaiah tendered his resignation as Karnataka CM to the Governor's Secretary in the presence of Deputy Chief Minister D.K. Shivakumar. Since he has rejected a Rajya Sabha seat to remain active in Karnataka, a few other options lie ahead for the veteran leader. 

Siddaramaiah refuses to go to Rajya Sabha - What are his options?
Karnataka politics: Siddaramaiah tendered his resignation as Karnataka CM to the Governor's Secretary in the presence of Deputy Chief Minister D.K. Shivakumar. Since he has rejected a Rajya Sabha seat to remain active in Karnataka, a few other options lie ahead for the veteran leader.