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Let m ,n are integers with 0ltnltm. A is...

Let `m ,n` are integers with `0ltnltm`. A is the point `(m ,n)` on the Cartesian plane. `B` is the reflection of `A` in the line `y=x`. `C` is the reflection of `B` in the y-axis, `D` is the reflection of `C` in the x-axis and `E` is the reflection of `D` in the y-axis. The area of the pentagon `A B C D E` is
a.`2m(m+n)` b. `m(m+3n)` c. `m(2m+3n)` d. `2m(m+3n)`

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