An investor sets up a retirement account with an initial balance of $\\$10,000$. The account earns interest at a continuous annual rate of$r = 6\%$. The investor deposits funds continuously at a rate of$D(t) = 5000e^{0.02t}$dollars per year, where$t$is the time in years. Which of the following is the correct formula for the balance$B(t)$of the account at any time$t$?