Which of the following is not used to control interference at RF?

Which of the following is not used to control interference at RF? Correct Answer Programmable digital notch filters

Physical antenna separation, frequency separation, programmable analog notch filters and active cancellation are the steps used to control interference at RF.

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If an entity owns directly or indirectly more than 50% of voting rights, control is presumed unless clearly proven that it is not control. Sometimes control exists, even if there is less than 50% of voting rightes exist. State which of the followings is/are example(s) of control even if voting power is less than 50%