A large bank has initiated a Lean Six Sigma program and chartered a team to improve the quality of credit decisions by reducing the number of errors in each commercial loan application. The Lean Six Sigma team wants to chart the number of defects per unit for the process. A sample of $20$ applications has been collected daily. The number of defects identified per sample is represented in the practice dataset. Which chart type should be used, and what are the upper and lower control limits$?$

A c$-$Chart, UCL $=2\mathrm{.}57,$ LCL $=1\mathrm{.}38$

B u$-$Chart, UCL $=2\mathrm{.}57,$ LCL $=1\mathrm{.}38$

C c$-$Chart, UCL $=2\mathrm{.}68,$ LCL $=1\mathrm{.}26$

D u$-$Chart, UCL $=2\mathrm{.}91,$ LCL $=1\mathrm{.}03$

E u$-$Chart, UCL $=2\mathrm{.}68,$ LCL $=1\mathrm{.}26$