How did the Nazgul know that Frodo left the Shire?

How did the Nazgul know that Frodo left the Shire?

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They went there and he was gone

He made deductions for traveling expenses.

He checked the menu and the tax policy (while flying a riverdancing eagle)

This

They asked around

it was the will of the force

When they went to check if Frodo had filled his tax returns and they weren't in the archive.

Correct answer. Always follow the money

youtube.com/watch?v=xAxR8pvca2o

They LITERALLY asked around