Which of the following code snippet can be used to get an input from user in JavaScript? input = window.input("Enter number of sold product #" + product + ":" ); input = window.prompt( "Enter number of sold product #" + product + ":"); input = window. writeln("Enter number of sold product #" + product + ":" ); input = window.alert( "Enter number of sold product #" + product + ":" ); Consider the following code snippet? if (c => 7) window.alert("c is greater than or equal to 7"); The relational operatior => is incorrect. The relational operator => implies greater than or equal to operator. The output will display an alert dialog "c is greater than or equal to 7". There is no error in this code. How is the sentinel value chosen in sentinel-controlled repetition, when the number of repetitions is not known in advance? Choose a sentinel value that cannot be confused with an acceptable input value Choose a sentinel value that is not a string Choose a sentinel value that is an acceptable input value O Choose a sentinel value that is not an integer Can the following word '$Value' be a valid variable name in JavaScript? Example var $Value; Yes O No Consider the code snippet. What displays in the alert box when x =2? The value of x+x is 4 O 2 + 2 The value of 2+2 is 4 Nothing Ox+x Consider the following JavaScript code snippet. Determine what the script prints without running it. Total is 14 Total is 3 O Total is 1 Total is 4 Total is 2