What will happen if you attempt to execute the instruction

INC SP in $8086$ assembly?

a$.$ Stack Pointer $($SP$)$ will be incremented by $2.$

b$.$ The instruction is invalid and will result in a runtime error.

c$.$ None of the given options

d$.$ The contents of $SP$ will be moved into the $Ax$ register.

e$.$ Stack Pointer $($SP$)$ will be incremented by $1.$