Optimizing code for performance

You are in the process of optimizing your code for performance in ABAP. You notice that there are a lot of global variables.

Could this be an issue? If so, what should be done?

Options

a. No, this is not an issue

b. Yes, you can pass them as arguments in internal subroutines

c. Yes, you should use call by reference for variables used in internal subroutines

d. Yes, each global variable must also have a local version

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