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Suppose you are writing JavaScript code to send an asynchronous GET request to the action.pl file on the server. You have instantiated an XHR object and saved it to the variable httpReq. Which statement should you use to begin the request?

Which JavaScript expression returns the substring “rock”?

Which JavaScript statement can you use to retrieve a query string from the current web page’s URL and assign it to the queryString variable?

What does the following JavaScript code do when the web page loads?window.addEventListener(“load”, function() {   let survey = document.forms.survey;   let lastName = orderForm.elements.lastName;   lastName.focus();});

What is the key difference between a two-tier and a three-tier client/server system?

When you must create several objects that share most of their properties and methods, _____.

What change should be made to the JavaScript statement document.write(“Who likes the song “Twinkle, Twinkle, Little Star”?”); if the intention is to display the string: Who likes the song “Twinkle, Twinkle, Little Star”?

How can you prevent a client from temporarily storing data sent within an HTTP message for later use?

Web storage _____.

Which JavaScript statement should you use to permanently store “MagicCity1” as the value for a user’s log-in name so that the browser can access it in the future?