What’s a better way to enable a feature – checkbox or dropdown?

Imagine a form where you can enable a feature. After enabling, you have some additional options related to the feature.

(A) Would you design a checkbox for enabling/disabling the feature + a dropdown list to select additional options

or

(B) Would you design a single dropdown with options: Disabled, Enabled with option 1, Enabled with option 2....

A

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B

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