Arrange the following examples of Artificial Intelligence (AI) in the order of increasing complexity :

A. Spam email detection using rule-based systems.

B. Handwritten digit recognition using shallow neural networks.

C. Image classification using convolutional neural networks.

D. Autonomous driving using reinforcement learning algorithms.

1. AA, B, C, D
2. BB, A, C, D
3. CA, B, D, C
4. DB, C, A, D

Pick an option to check yourself, or open the answer below.

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Correct answer: A. A, B, C, D

Explanation

Rule-based spam filtering is simplest, then a shallow network for digit recognition, then deep CNNs for image classification, and reinforcement-learning-based autonomous driving is the most complex.