Consider the following features of neural networks:
A. It is essentially a machine-learning algorithm.
B. It is useful for problems where the data set is very large.
C. It can extract features without input from the programmer.
D. It is a system modelled on the human brain and nervous system.
Choose the most appropriate answer from the options given below:

1. AA Only
2. BA & B Only
3. CA, B & C Only
4. DA, B, C & D

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