Question SPL - Sailplane Pilot License - Operational Procedures

A plane flying below an extended Cumulus cloud developing into a thunderstorm, the glider plane quickly approaches the cloud base. What actions have to be taken by the glider pilot? - SPL

Extend spoiler flaps within speed limits, leave thermal lift area with maximum permissable speed

Fasten seat belts, be aware of severe gust during further thermaling

Reduce to minimum speed, leave thermal lift area in a flat turn

Climb into thunderstorm cloud, continue flight using instruments