2. Perform the indicated operation:
[tex]4 \sqrt{11} + 2 \sqrt{11} - \sqrt{11} [/tex]
[tex]a.11[/tex]
[tex] b. \sqrt{11} [/tex]
[tex]c.5 \sqrt{11} [/tex]
[tex]d.6 \sqrt{11} [/tex]

​