The resistors in this circuit are called ___________ resistors because they are connected to Vcc.A) outputB) pull upC) pull downD) inverted The image illustrates a 4-to-1 Multiplexer, a digital device used in electronic circuits to select one of four input data lines and route it to a single output line. The diagram consists of the following components:1. **Inputs (on the left side)**: - D0 - D1 - D2 - D3 These inputs represent the data lines that the multiplexer can select from.2. **Select Lines (near the top)**: - S0 - S1 These are the control lines used to determine which input data line is connected to the output. The combination of signals on these lines selects one of the four data inputs.3. **Output (on the right side)**: - This is where the selected input data is sent.4. **Truth Table**: - Displayed below the multiplexer are the select lines S1 and S0 followed by the data inputs D3, D2, D1, and D0 in that sequence, demonstrating the flow of selected data based on the select lines.In operation, the select lines S1 and S0 determine which one of the four inputs (D0 to D3) is connected to the output. For example, if S1 and S0 are both 0, D0 is routed to the output. If S1 is 0 and S0 is 1, D1 is routed to the output, and so on, following binary counting. This device is fundamental in digital circuits for managing multiple data paths efficiently.

The given circuit is the interfacing of matrix keyboard with two ports A and B. Port A works as output port and Port B as input port.To prevent the direct short-circuit, in case of, any key is pressed that can damaged the pin; pull up resistors are used to limit that short-circuit current. Answer: The option (B) pull up is correct.