When the code that follows is executed, a message is displayed if the value the user enters var userEntry = (prompt("Enter cost:"); if (isNaN(userEntry) || userEntry > 500 ) { alert ("Message"); } a. isn’t a number and the value in userEntry is more than 500 b. is a number and the value in userEntry is more than 500 c. isn’t a number or the value in userEntry is more than 500 d. is a number or the value in userEntry is more than 500