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A geyser erupts, shooting water into the air with an initial upward velocity of $29.4\,\text{meters per second}$. Therefore, the height of a single water droplet above the ground in meters, $t$ seconds after it comes out of the geyser, can be modeled by the expression $-4.9t^2 + 29.4t$. This expression can be written in factored form as $-4.9t(t - 6)$. What does the number $6$ represent in the expression?$\newline$(A)the height in meters of a water droplet when it comes out of the geyser$\newline$(B)the height in meters of a water droplet when it reaches its highest point$\newline$(C)the time in seconds from when a water droplet comes out of the geyser until it hits the ground$\newline$(D)the time in seconds from when a water droplet comes out of the geyser until it reaches its highest point