Which of these subspecies of wolf is extinct?

The Beringian wolf is an extinct type of wolf (Canis lupus) that lived during the Ice Age. It inhabited what is now modern-day Alaska, Yukon, and northern Wyoming. Some of these wolves survived well into the Holocene. The Beringian wolf is an ecomorph of the gray wolf and has been comprehensively studied using a range of scientific techniques, yielding new information on the prey species and feeding behavior of prehistoric wolves. It has been determined that these wolves are morphologically distinct from modern North American wolves and genetically basal to most modern and extinct wolves. The Beringian wolf has not been assigned a subspecies classification and its relationship with the extinct European cave wolf (Canis lupus spelaeus) is not clear.

The North American wolf Canis lupus pambasileus is a subspecies of gray wolf that is referred to as the Interior Alaskan wolf in the United States and the Yukon wolf in Canada where it ranges in adjacent parts of British Columbia and Northwest Territories.

The Himalayan wolf (Canis lupus chanco) is a canine of debated taxonomy. It is distinguished by its genetic markers, with mitochondrial DNA indicating that it is genetically basal to the Holarctic grey wolf, genetically the same wolf as the Tibetan wolf, and has an association with the African golden wolf (Canis anthus).

The Mackenzie River wolf (Canis lupus mackenzii) is a subspecies of gray wolf which is found in Canada's southern portion of Northwest Territories.