Incident at Morales $---$

Although the chemical process was designed for automated operation, Fred allowed Manuel to volunteer to control the process manually. Under what conditions would this be a safe and reasonable thing to do$?$ Pick the best answer.

A$.$

If the process were designed from the outset with an option for manual operation with proper safety controls and protection for operators, then manual operation would be a safe and reasonable thing to do during regular production.

B$.$

Manual operation would never be a safe and reasonable thing to do under any circumstances.

C$.$

If the company's workman's compensation insurance allowed manual operation of automated production then this would be a reasonable and safe thing to do$.$

D$.$

If Manuel signed a statement releasing the company from any liability, then manual operation would be a reasonable and safe thing to do during regular production.

E$.$

If the system provided a "maintenance" mode for manual operation, then this would be a safe and reasonable thing to do during regular production.