What happens when you add switch running an ealier IOS version to a StackWise configuration running a later version?

Question:
What happens when you add switch running an ealier IOS version to a StackWise configuration running a later version?

• The stack ignores the switch until you update the IOS version on the switch.
• The switch software downgrades the IOS version on the stack to match the version on the switch
• The switch software upgrades the IOS version on the switch to match the version on the stack
• The switch keeps its version of IOS and uns normally as part of the stack

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