If $p$ and $q$ are pointer variable names and $a$ is an array, which of the following expressions are not syntactically correct, because they violate the rules concerning lvalues and rvalues?

a$.*$p $=p+2$;

b$.$ &$p=$&$a[0]$;

c$.q=$&$(p+2)$;

d$.a[5]=5$;