When vectoring an IFR flight around an active thunderstorm cell (Cumulonimbus - CB), what is the best practice and recommended minimum clearance distance applied by ATC?

1. Vector the aircraft directly through the center of the core to minimize flight time
2. Approve pilot-requested weather deviations promptly, vectoring the aircraft upwind of the storm cell with at least 10 to 20 NM lateral clearance if possible
3. Instruct the aircraft to descend to 500 ft AGL and fly beneath the cloud base
4. Require the pilot to switch off airborne weather radar to avoid electromagnetic interference