Could Italy open the war with a strike on Toulon?

Could the Regia Marina have attacked Toulon as Italy entered the Battle of France?

It was possible but risky; Toulon's defenses could inflict losses, and destroying French ships might later help the Royal Navy.

Toulon was a more defensible target than Mers-el-Kebir, so an opening strike would be possible but hazardous. Its shore defenses could cost the Regia Marina ships before the French fleet was disabled. A successful attack might nevertheless inflict severe damage on French naval strength. If France then fell, those losses could simplify Britain's later problem by reducing the number of powerful French ships whose allegiance and disposition had to be resolved.