How should joint inventors sign a micro entity certification?

Q: How should joint inventors sign a micro entity certification?

For joint inventor applicants, MPEP 509.04(c) states that "each joint inventor should sign a separate copy of the relevant micro entity certification form." However, there is an exception: "If one joint inventor is appointed to prosecute the application on behalf of all the other joint inventors, then only that one joint inventor need sign the micro entity certification form." This appointment can be made using USPTO form PTO/AIA/81, titled "Power Of Attorney To One Or More Of The Joint Inventors And Change Of Correspondence Address", available on the USPTO forms Web page . To learn more: joint inventors micro entity certification power of attorney

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For joint inventor applicants, MPEP 509.04(c) states that "each joint inventor should sign a separate copy of the relevant micro entity certification form." However, there is an exception:

"If one joint inventor is appointed to prosecute the application on behalf of all the other joint inventors, then only that one joint inventor need sign the micro entity certification form."

This appointment can be made using USPTO form PTO/AIA/81, titled "Power Of Attorney To One Or More Of The Joint Inventors And Change Of Correspondence Address", available on the USPTO forms Web page.

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How should joint inventors sign a micro entity certification?