Which of the Following Statements A), B) or C) Is

Which of the following statements a) , b) or c) is false?

A) We've used xe "one-hot encoding[one hot encoding]"one-hot encoding to convert the MNIST dataset's integer labels into xe "categorical data"categorical data. The result for each label was a vector in which all but one element was 0. We could also do that for the index values that represent the words in the IMDb dataset.
B) For our IMDb example that processes 10,000 unique words, we'd need a 10,000-by-10,000 array to represent all the words. That's 100,000,000 elements, and almost all the array elements would be 0. This is not an efficient way to encode the data.
C) If we were to process all 88,000+ unique words in the IMDb dataset, we'd need an array of nearly eight billion elements.
D) All of the above statements are true.