What resolution defines Standard Definition (SD) cameras?

Standard Definition (SD) cameras are characterized by specific resolutions that fall below the levels of High Definition (HD). The resolutions typically recognized as Standard Definition are 720x576 pixels for the PAL format and 720x480 pixels for the NTSC format. These resolutions serve as the benchmarks for SD video quality and reflect the limitations of older analog and early digital broadcasting systems.

The other options represent resolutions associated with different standards. For instance, 1920x1080 is classified as Full High Definition (FHD) and 1280x720 as HD. The resolution 640x480, while it was once considered standard in early video formats, is generally regarded today as being below the typical range for Standard Definition video. Therefore, option C accurately identifies the resolutions defining Standard Definition cameras.