Jillana takes a single dose of medication that remains in her body according to the equation \( r = 200 ( 0.75 ) ^ { d } \) , where \( r \) represents the amount of medication remaining after d days. If Jillana had taken the medication two days earlier, the amount of medication remaining in her system relative to the amount that remains in her system after d days would be represented using the equation \( r _ { 2 } = 200 ( 0.75 ) ^ { d + 4 } \) . Which of the following is an equivalent equation?

\( r _ { 2 } = 63.28 ( 0.75 ) ^ { d } \)

\( r _ { 2 } = 199.68 ( 0.75 ) ^ { d } \)

\( r _ { 2 } = 200.32 ( 0.75 ) ^ { d } \)

\( r _ { 2 } = 632.10 ( 0.75 ) ^ { d }\)