$1.$The C$++$ statement below declares an array and a pointer:

int arr$\_1[10],*$arr$\_2$;

Determine if each expression below is valid or not, and briefly explain why.

a$.$ arr$\_1=$ arr$\_1+5$;

b$.$ arr$\_2=$ arr$\_2+10$;

c$.$ arr$\_2=$ &arr$\_1$;

d$.$ arr$\_2=$ arr$\_2-$ arr$\_1$;

e$.$ arr$\_1[2]=$ arr$\_1-$ arr$\_2$;

Hint: "validity" means that the expression can be interpreted and executed by the C$++$ compiler $$

not necessarily that it makes sense to the programmer.