Assuming field$\_$category has the values sales, technical, and engineering, which output file$($s$)$ will be generated using this configuration of the output data tool?

a$.2015-$sales.cvs $2015-$tachnical.csv $2015-$engineering.csv

b$.$ Sales$-2015.$csv technical$-2015.$csv engineering$-2015.$csv

c$.2015-$sales$-$technical$-$engineering.csv

d$.2015-$csv