Which of the following two precipitation types require a temperature inversion in the lower troposphere?

Question

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Freezing rain and ice pellets both require a temperature inversion in the lower troposphere. Freezing rain forms when snowflakes melt into raindrops in a layer of warm air, but then freeze again upon contact with below-freezing surfaces near the ground. Ice pellets, or sleet, form when raindrops fall through a shallow layer of freezing air near the ground and partially freeze before hitting the surface. In both cases, the presence of a temperature inversion is necessary to maintain the freezing layer close to the surface while warmer air exists aloft.

Which of the Following Two Precipitation Types Require a Temperature