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Option 1: NH 4 - This option is incorrect. NH 4 is a national highway that connects Chennai to Mumbai, not Visakhapatnam.
Option 2: NH 5 - This option is correct. NH 5 is the national highway that connects Chennai and Visakhapatnam. It is a major road that runs through the states of Andhra Pradesh and Tamil Nadu, connecting two important cities.
Option 3: NH 6 - This option is incorrect. NH 6 is a national highway that connects Hazira in Gujarat to Kolkata in West Bengal. It does not connect Chennai and Visakhapatnam.
Option 4: NH 8 - This option is incorrect. NH 8 is a national highway that connects Delhi to Mumbai. It does not connect Chennai and Visakhapatnam.
The correct answer is option 2, NH 5, as it is the national highway that directly connects Chennai and Visakhapatnam.