Which Rule set to use to set Expense Report Approval using approval group in Parallel mode?

Summary:

Client has the requirement that expense reports approval should go to all the members of an approval group parallelly and the expense report should get approved as soon as any one of them approves it.

Content (required):

The expectation is as below :

Employee creates and submits expense report for approval. Expense report should go for approval to an approval group that contains 5 members say A,B,C,D and E. All the 5 members should get notification to approve the expense report simultaneously and the first respondent to approve should be considered as Expense Report approver and rest of the members don't need to approve it. We have created the Approval Group in the system but we are not sure under which Rule Set do we need to configure this so that approvals work as per the expectation.