Do the claws of scorpions and crustaceans have a common origin or are they convergent evolution?

I read somewhere that scorpion claws evolved not from legs but from mouth parts. That left me wondering... what does that mean for the evolution of crustaceans and arachnids?

All crustaceans (that I can think of) have some sort of claws: crabs, lobsters, even shrimps, and I know that crustaceans and arachnids are related, but then spiders have no claws while scorpions do so here are the options I see:

• The common ancestor of arachnids and crustaceans had claws but spiders lost them for some reason

• The common ancestor of arachnids and crustaceans did NOT have claws, instead it evolved into two species, the common ancestors of crustaceans and the common ancestor of arachnids. The one of crustaceans had claws and the one of arachnids didn't, but then the common ancestor of scorpions developed claws in a case of convergent evolution

Is any of those options correct?, if not, what is the correct explanation?

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source https://www.reddit.com/r/Entomology/comments/kmjt3j/do_the_claws_of_scorpions_and_crustaceans_have_a/