What Will Be The Firstname And Surname Of The Following #81

What will be the firstname and surname of the following JavaScript code?</p> <pre><code class="language-javascript"> var book = { "main title": "JavaScript", 'sub-title': "The Definitive Guide", "for": "all audiences", author: { firstname: "David", surname: "Flanagan" } }; </code></pre>

This multiple choice question (MCQ) is related to the book/course gs gs106 Javascript. It can also be found in gs gs106 Lexical Structures - JavaScript Object Attributes and Serialization - Quiz No.1.

 var book = { "main title": "JavaScript", 'sub-title': "The Definitive Guide", "for": "all audiences", author: { firstname: "David", surname: "Flanagan" } };