Q1: What does SFC use for? Q2: List down the symbol and description of the edit tools of SFC programming language. Q3: Mention the SFC supported action type and their function. Q4: Consider the automatic drill depicted in the picture: When the operator presses a start button, the drill starts approaching the piece at high speed, until it reaches a switch where the speed has to be lowered. The drill then moves all the way to the bottom, until a switch is reached that corresponds to the bottom limit. The drill then moves upright, until it reaches the upper limit switch. Assume the drill lifter motor driver is driven by three digital signals coming from Q01,Q02, and Q03 according to the truth table shown bellow. Create SFC chart based on the above discription