The Following Output from MINITAB Presents the Results of a Hypothesis

Multiple Choice

The following output from MINITAB presents the results of a hypothesis test for a population mean $\mu$ .
Test of mu $= 45$ vs. not $= 45$
$\begin{array}{lrrccrl}\mathrm{N} & \text { Mean } & \text { StDev } & \text { SE Mean } & 95 \% \mathrm{CI} & \mathrm{T} & \mathrm{P} \\57 & 41.69 & 11.961865 & 1.584388 & (38.516105,44.863895) & -2.089135 & 0.0412\end{array}$

How many degrees of freedom are there?

A) 58
B) 45
C) 56
D) 57