What is required for a customer to receive a discount when presenting a senior button?

To receive a discount when presenting a senior button, a customer must present a senior card or explicitly ask for the discount. This requirement ensures that the restaurant can validate the senior status of the customer, thus allowing them to apply the appropriate discount. It's a straightforward process that prioritizes clarity and ensures that both the customer and the restaurant staff understand the basis for the discount.

The other options do not align with the established procedure for granting this discount. Ordering a large meal, making a reservation, or being a member of a frequent diner program do not play a role in qualifying for the senior discount, highlighting the importance of customer verification through the appropriate documentation or request.