Multiplexers

To design a **16:1 multiplexer** using 2:1 multiplexers, we need to use a hierarchical design. Here's how it works:

- For **16:1** multiplexing, we use **8** 2:1 multiplexers at the first level.

- From these **8** outputs, we use **4** 2:1 multiplexers at the second level.

- From these **4** outputs, we use **2** 2:1 multiplexers at the third level.

- Finally, we need **1** 2:1 multiplexer at the last level. Thus, in total, the required number of multiplexers is: Therefore, the correct number of **2:1 multiplexers** is **12**.