How to Get approver/Reject person attribute through Email

Hi ,

in Approval WF i have assigned  three people as Approver (supervisor) / (Backupsup) / (Admin)

but any one people can approve that request  and which attribute in Aveksa will store the Approver name to generate an email that

Dear requestor

your request approved my the (approver name).

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Dear requestor

your request approved my the (rejector name).

can you please help me how can we proceed on  this