Use Random-Variable Notation to Represent the Event $\{ X \geq 3 \}$

Multiple Choice

Use random-variable notation to represent the event.
-Suppose a coin is tossed four times. Let X denote the total number of tails obtained in the four tosses. Use random-variable notation to represent the event that the total number of tails is three.

A) HTTT, THTT, TTHT, TTTH
B) $\{ X \geq 3 \}$
C) $\mathrm { P } \{ \mathrm { X } = 3 \}$
D) $\{ X = 3 \}$