It's Popcorn on the floor!

$\begin{aligned} A & = & \lfloor e^{\pi} \rfloor + \lceil e \rceil \\ B & = & \lfloor e \rfloor + \lceil \pi^e \rceil \\ C & = & \lfloor \pi^e \rfloor + \lceil e \rceil \\ D & = & \lfloor \pi \rfloor + \lceil e^\pi \rceil \\ \end{aligned}$

Which of the following is correct?

Notations : $\lfloor \cdot \rfloor$ denotes the floor function and $\lceil \cdot \rceil$ denotes the ceiling function .