Which of the following is NOT a quality level of Ruby-style ports?

The quality levels of Ruby-style ports are well-defined, and they typically include Ruby Port, Reserva Ruby Port, and Late Bottled Vintage (LBV) Port. Each of these categories has specific characteristics and aging requirements that distinguish them from one another.

Ruby Port is the basic level of this style, known for its youthful vibrancy and fruit-forward profile. Reserva Ruby Port undergoes a longer aging process, which adds complexity and depth to its flavor profile. Late Bottled Vintage Port, while still a Ruby-style port, comes from a single vintage and is bottled later than typical Ruby Ports, allowing for greater maturation and development of its flavors.

"Classic Ruby Port" is not an officially recognized quality designation within the established categories of Ruby-style ports; thus, it does not represent a distinct level of quality. The terminology may be used informally, but it does not adhere to the formal classifications that are accepted in the wine industry. This is why it stands out from the other options, which are all established categories of Ruby-style ports.