1. The first screenshot at right is theinitial rendering of prob1.html. The textboxfor the first number has name=”num1″, andthat for the second number has name=”num2″.All the radio buttons have name=”op”. Thevalues of the radio buttons are, respectively,”add”, “sub”, “mul”, and “div”. A radiobutton can be selected not only by clickingdirectly on it but also by clicking its label. Notethat the radio buttons are all inside a fieldsetwith a legend.It is expected that the user will enter numbersinto the two textboxes then clickSubmit, which sends a GET request toprob1.php.The second screenshot shows theform with numbers 2 and 3 entered. The thirdscreenshot
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