26) [[Question 1.29 in text] All highway bridges in the United States are inspected periodically for structural deficiency by the Federal Highway Administration (FHWA). Data from the FHWA inspections are compiled into the National Bridge Inventory (NBI). Several of the nearly 100 variables maintained by the NBI are listed below. How was the NBI data obtained? (1 pt) a) By inspection b) Using automated software c) Downloaded from database d) From the Internet wal 20