Fill the validateForm function to check that the phone number contains a number (use the isNaN function) and that the user name is less than 11 characters long. Display "Phone number is invalid" and/or "User name is invalid" in the console log if the check does not pass. Use the preventDefault function to avoid submitting the form when the inputs are invalid.

Hi there! This question is asking to write a Javascript validation function to validate user input. Assuming the input fields have the id set as “phone_number” for the phone input, and “user_name” for the User’s name, we can write the function below to do the validation as required.

Explanation:

function validateForm() {

   if isNaN(document.getElementById(“phone_number”).value) {

       document.getElementById(“phone_number”).addClass(“error”)

       console.log(“Phone number is invalid”)

   }

   if document.getElementById(“user_name”).length < 11 {

       document.getElementById(“user_name”).addClass(“error”)

       console.log(“User name is invalid”)

   }

   document.getElementById(“submit”).addEventListener(“click”, function(e) {  

       if document.getElementById(“phone_number”).hasClass("error") || document.getElementById(“user_name”).hasClass(“error”)  {

           e.preventDefault();  

       }

   });

}

given the options, i would say your best bet is c. the modem supports up to 56 kbps, which is too low for video streaming. dial up modems use actual phone lines, which only can go up to 56 kbps as that's more than sufficient for traditional phone calls. this is also the reason why when a dial-up modem connects, you hear all those sounds. it's literally using the phone line to establish a connection.