Given the following linked list structure and variable declaration and assignment struct list{ float val; struct list * link; }; struct list x; which of the following lines attaches a new link?

a.		x->link=malloc(sizeof(struct list));
b.		x->link=(struct list *)malloc(sizeof(struct list));
c.		x.link=(struct list *)malloc(sizeof(struct list));
d.		x.link=(struct list)malloc(sizeof(struct list));