Reflect the following matrix about the vertical axis.
[[1, 2], [3, 4]]
The matrix reflected about the vertical axis is:
[[2, 1], [4, 3]]
Complete the following task based on the instruction and optional input provided.### Instruction:
Reflect the following matrix about the vertical axis.

### Input:
[[1, 2], [3, 4]]

### Output:
The matrix reflected about the vertical axis is:
[[2, 1], [4, 3]]