Answer is: A) Image hosting sites
Explanation:
Image viewer software displays images. Web browsers can display standard internet image formats including GIF, JPEG, and PNG. Some can show SVG format which is a standard W3C format. In the past, when Internet was still slow, it was common to provide "preview" image that would load and appear on the web site before being replaced by the main image (to give at preliminary impression). Now Internet is fast enough and this preview image is seldom used.
Some scientific images can be very large (for instance, the 46 gigapixel size image of the Milky Way, about 194 Gb in size). [11] Such images are difficult to download and are usually browsed online through more complex web interfaces.
Some viewers offer a slideshow utility to display a sequence of images.
