What You Need to Do for Part $1.$ Define the following functions $$ INCR $,$ PLUSTWO $,$ and MULTIPLY in lambda calculus. A$.$ Define INCR which takes a Church numeral for n as an argument, and produces the subsequent Church numeral, which represents n$+1.$ B$.$ Define PLUSTWO which takes a Church numeral for n $($assume n $>0)$ as an argument, and produces the subsequent Church numeral $($representing n$+2).$ C$.$ Define MULTIPLY which takes two Church numerals, each representing n and m $($assume n$,$m $>0)$ as arguments, and produces an expression that represents m $$ n$.$ Use m$,$ n$,$ INCR $,$ Z $,$ as well as parentheses. Use the following template.