Given the following parts and modules: 1. Arduino UNO microcontroller. 2. Four Potentiometers. 3. Four regular DC motors. 4. One Servo Motor 5. External power source 6. 2 x SN754410 IC Draw the architecture and write the required code to build a multi-head drilling machine that consists of four drilling heads each attached to a DC motor, the rotation speed of each DC motor is controlled by a potentiometer, the choice of using the requested drilling head is controlled by a servo motor. The Serial Monitor with letter a, b, c, d must be used in order to enable the user to choose the required drilling head.