In standard hexadecimal system, what is the representation of the 12th value/digit (counting from 0 as the 1st digit, where 0 to 9 are the first 10 digits)?

Which of the following multiplexers has 4 select lines (data select inputs)?

The technology used to integrate thousands to millions of transistors onto a single chip for fabricating integrated circuits is called:

Which type of signal is discrete in time and quantized in amplitude?