Reusing Resource in WPF Best Practice

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WPF

Hi All,

In my application i am using lot of resources. I want to reuse the resource across my application.

Shall i create each resource as separate file and Merge resource in each control. (OR) I have to duplicate resource in all the user controls (Because creating each resource in separate file increase dll size)

For example:
ResourceA and ResourceB

Resource A is required in ControlA, Resource B is required in ControlB and Resource A and B both required in ControlC.

Which one is the Best practice?

1. Shall i create separate resource file for A and B so that changing the resource will affect all the place
(OR)
2. Create a common resource file and add both the resources and merge the resource in all the controls. (Here Resource B is not required for ControlA and Resource A is not required for ControlB)

Please Tell me the Best practice.