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When M-mode is employed during an echocardiogram, it provides information on depth, time, and frequency on the display. M-mode (Motion-mode) is a one-dimensional display that shows motion over time. It is particularly useful in assessing the timing and extent of cardiac structures' motion, such as the chambers of the heart, valves, and walls. The depth indicates the position within the tissue being scanned, time shows the movement over time, and frequency is related to the characteristics of the tissue being imaged. Therefore, choice C is the correct answer as it correctly identifies the information portrayed on the display when M-mode is used in an echocardiogram.