What does “DSLR” stand for when referring to cameras?

Here is the question :

WHAT DOES “DSLR” STAND FOR WHEN REFERRING TO CAMERAS?

Here is the option for the question :

• Database, statistical learning, and recovery
• Diagram sequencing for lag reduction
• Digital single-lens reflex
• Dual standard lens ratio

The Answer:

And, the answer for the the question is :

Explanation:

[STC0014396]. If you’ve ever watched a movie in which a photographer used an old view camera, and you weren’t distracted by the flash bulb going off in the photographer’s hand, you might have observed that the plate of the camera was removed in order to line up the shot. In these types of cameras, light first enters the lens, then travels through a flexible bellow, and finally strikes a recording medium, such film, that is housed within a huge plate. This plate totally obstructs the view of the photographer; in order to see through the lens, the plate must be lifted, and then it must be replaced when the photographer has lined up the shot. In the ensuing years, manufacturers of cameras have developed a variety of solutions to the problem of preventing a recording media from obstructing a viewfinder. One technique is to detach the viewfinder from the primary lens of the camera. This allows the photographer to observe the scene through the viewfinder from a slightly different vantage point than what will ultimately be captured in the photograph. The single-lens reflex camera is becoming an increasingly common option. In this scenario, light travels through the camera’s single lens, strikes a slanted mirror, is reflected off of either a prism or another mirror, and finally arrives at the viewfinder. This allows the photographer to see exactly what is captured by the camera’s single lens. The light is diverted onto the film or, in the case of a DSLR, the digital imaging sensor when the shutter button is pressed. This action is accompanied by a distinctive clicking sound.