Final answer:
The correct action when a customer requests a cold pour tea is to add ice without extra charge, which will cool down the tea through the energy transfer involved in the melting of the ice.
Step-by-step explanation:
If a customer requests a cold pour tea, the correct action to take is to top the drink with ice for no additional charge. This is necessary to ensure that the tea is cold as the customer desires. Adding ice to the tea will lead to a decrease in the temperature of the beverage due to the energy transfer required for the ice to melt, as shown by examples involving endothermic phase changes, such as the cooling of tea by adding ice. The inclusion of condensation on the exterior of the glass also indicates a reduction in temperature, as seen in example 12.7.1.