You can definitely never predict what will happen

I found an example in Cambridge Dictionary(https://dictionary.cambridge.org/grammar/british-grammar/adverbs-and-adverb-phrases-position):

You can definitely never predict what will happen.

In the above example, what is the adverb "definitely" modifying?

a) You can [[definitely never] predict] what will happen. ('definitely' modifying 'never') Or

b) You can [never [predict definitely]] what will happen. ('definitely' modifying 'predict')

Can I write the original sentence the same way as b)?