Considering the following definitions: struct student

$\}$

char$*$ name;

long ID:

float avg;

int$*$ grades;

$\{$

student $*$ A$[2]$;

A$[$O$]=$new student; All$]=$new student;

Which of the following produces an error?

Select one:

$$a$.$ cin$>>$A$|1]->$grades;

$$ b$.$ cin$>>$ Al$1]->$name;

@ c$.$ cin$>>$A$|1]->$avg;

$$ d$.$ choice$$a$$and$$choice$$b