The ABC chemical processing plant uses a computer to monitor the temperature and pressure of four chemical tanks as shown in Figure $1-2.$ Whenever the temperature or a pressure exceeds the danger limit$,$ an internal tank sensor applies a $1$ to its corresponding output to the computer. If the condition still in operating limit$,$ then the output are $0.$

a$)$ If the computer reads the decimal number $201,$ what problem exists?

b$)$ What is the problem if the computer reads $A4H?$

c$)$ What is the decimal and hexadecimal number if temperature and pressure for all tanks are over the limit$?$