Which of the following is the solution to the differential equation dP dt + P = 10 with the initial condition P(0) = 4 ?

a. P = -1 + √20t + 25
b. P = 5 - e⁻ᵗ
c. P = 10 - 6e⁻ᵗ
d. P = 10 - 6eᵗ