Find all values of x where the function is discontinuous. k(x)=x-4 Select the correct choice below and, if necessary, fill in the answer box to complete your choi OA. The function is discontinuous when x < OB. The function is discontinuous when xs OC. The function is discontinuous when x OD. The function is discontinuous when x> OE. The function is discontinuous when x= (Use a comma to separate answers as needed.) OF. The function is continuous