What will be the output of the following code?import functoolsimport operatordef factorial$($n$)$:$"""$ Factorial of a number.$>>>$ factorial$(0)1>>>$ factorial$(1)1>>>$ factorial$(5)120>>>$ factorial$(10)3628800"""$return functools.reduce$($operator$.$mul, range$(1,$ n$+1))$if $\_\_$name$\_\_=="\_\_$main$\_\_"$:import doctestdoctest.testmod$($verbose$=$True$)$This type of question contains radio buttons and checkboxes for selection of options. Use Tab for navigation and Enter or space to select the option.optionA$2$ items had failures: $2$ of $4$ in $\_\_$main$\_\_.$factorialoptionB$1$ items had failures: $1$ of $4$ in $\_\_$main$\_\_.$factorialoptionC$4$ passed and $0$ failedoptionDError on line $2$