&#123;    delegate void A&#40;ref string str&#41;;    class sample    &#123;        public static void fun&#40; ref string a&#41;        &#123;            a = a.Substring&#40; 7, a.Length - 7&#41;;        &#125;    &#125;    class Program    &#123;        static void Main&#40;string&#91;&#93; args&#41;        &#123;            A str1;            string str = &quot;Test Your C#.net skills&quot;;            str1 = sample.fun;            str1&#40;ref str&#41;;            Console.WriteLine&#40;str&#41;;        &#125;    &#125;&#125;
A. Test Your
B. ur C#.NET
C. ur C#.NET Skills
D. None of the mentioned
Answer:A
&#123;    delegate void A&#40;ref string str&#41;;    class sample    &#123;        public static void fun&#40; ref string a&#41;        &#123;            a = a.Substring&#40; 7, a.Length - 7&#41;;        &#125;    &#125;    class Program    &#123;        static void Main&#40;string&#91;&#93; args&#41;        &#123;            A str1;            string str = &quot;Test Your C#.net skills&quot;;            str1 = sample.fun;            str1&#40;ref str&#41;;            Console.WriteLine&#40;str&#41;;        &#125;    &#125;&#125;
A. Test Your B. ur C#.NET C. ur C#.NET Skills D. None of the mentioned
Explanation: None.