Which type of cloud is typically low-lying, gray, and often associated with drizzle or light rain, covering the entire sky?

Explanation

Stratus clouds are flat, hazy, featureless clouds of a uniform gray color that often cover the entire sky and are associated with light rain or drizzle. Cirrus clouds are high and wispy, cumulonimbus are large thunderstorm clouds, and altocumulus are mid-level, lumpy clouds.