Which of the following is not required when verifying fitness for use of a direct inflow measurementdevice?a. Record at least 2 readings with less then a 5% average difference.b. Use a device with NIST traceable calibration.c. On cabinets with a movable sash, seal the sash.d. Seal the device to the front opening.e. Record at least 5 readings with less than a 2% average difference