What was the poem in the Superbowl Monster.com ad?

During the Superbowl, Monster.com had this ad which showed people passing a woman on a busy city street, and each person recited parts of a famous poem I'm heard before. The poem was about two roads and the author had to make a decision which to take and it ended with the line 'And I took the one less travelled by.' Please tell me the name of the poem and the author. Thank you very much!

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