Answer: c) Dates peaks and troughs only after the fact .
The NBER dating committee maintains a chronology of the business cycles in US. The data consists of the dates of the peaks and troughs in economic activity.
The NBER dating committee does not provide the data ahead of a recession or expansion, rather it functions as a historian of recording the peaks and troughs in economic activity.
The NBER dating committee reconciles several data before actually determining and announcing the month a recession started. The decision is based on several economic indicators that are very frequently revised. The economic estimate that has the most number of revisions is the GDP estimate. The NBER takes all the revisions made to the economic indicators including the GDP and then provides the month a recession started or ended. This is the main reason for the delay in determining the month a recession began or ended.
Hence this is one of the criticisms leveled against the NBER dating committee.