Let a and b be real numbers. Find all vectors (5,a,b) orthogonal to (4,6,7). What are all the vectors that are orthogonal to (4,6,7) ? Select the correct choice below and, if necessary, fill in any answer boxes within your choice. O A. Vectors of the form (5,a,b) , where (a,b) = (Type an ordered pair. Use a comma to separate answers as needed.) O B. Vectors of the form (5,a, , where a is any real number (Type an expression using a as the variable.) O C. There are no vectors of the form (5,a,b) , where a and b are real numbers