Rewrite each of the following arithmetic expressions to take advantage of concurrent processing and then code each. Use the terms COBEGIN and CO to delimit the sections of concurrent code. a$.$ A$+$B$^(**)$R$^(**)$Z$-$N$^(**)$M$+$C$2$ b$.($x$^(**)($Y$^(**)$Z$^(**)$W$^(**)$R$)+$M$+$N$+$P$)$ c$.(($J$+$K$^(**)$L$^(**)$M$^(**)$N$)^(**)$I$)$