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During a match of badminton, Josh swings his racquet and hits the birdie high up into the air. The birdie's height above the ground in meters can be modeled by the expression $1.4 + 6t - 4.9t^2$, where $t$ is the time in seconds after Josh hits the birdie.$\newline$What does the number $1.4$ represent in the expression?$\newline$(A)the height in meters of the birdie when Josh hits it$\newline$(B)the time in seconds from when Josh hits the birdie until it hits the ground$\newline$(C)the time in seconds from when Josh hits the birdie until it reaches its highest point$\newline$(D)the height in meters of the birdie when it reaches its highest point