The unit surface normal of the sphere x² + y² +2²=a² is. a)1/a (x²-yj+zk) b)1/a (xi+yj-zk) c)1/a(-xi+yj+zk) d)1/a(xi+yj+zk)​



hii min sofi , I'm Brindhaa, I'm from India how are you