Joe writes the following code to separate MNIST data into testing, training, and validation sets. The output of his code is also shown. What values has he used for $A=$

$,B=C=C=l,$ and $D=$

$?$

Note: The answers must be in numbers and x$.$xx format. You could refer to the lecture to see the required format of your response.

$[1]$ from keras.datasets import mnist

import matplotlib.pyplot as plt

import numpy as np