An iced coffee is generally prepared using which of the following?

Iced coffee is typically made using double brewed coffee, which involves brewing coffee at a higher strength and then cooling it down. This method enhances the coffee's flavor and ensures that it remains robust even when chilled and diluted by ice. The double brewing process creates a concentrated coffee that can hold up against the melting ice, maintaining a rich taste without becoming overly watery.

While other methods like using espresso shots could result in a strong beverage, the classic iced coffee preparation favors a brew that is then cooled, giving it the characteristic flavor and body that people expect from iced coffee. Instant coffee and ground coffee without brewing wouldn't achieve the depth of flavor that double brewing offers, making them less suitable for a traditional iced coffee experience.