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The correct answer is option 4: NH7 and NH9.
To understand why this is the correct answer, let`s look at each option:
Option 1: NH4 and NH6 - This pair of National Highways does not cross Andhra Pradesh, Karnataka, and Maharashtra. NH4 runs from Chennai in Tamil Nadu to Thane in Maharashtra, while NH6 runs from Kolkata in West Bengal to Hajira in Gujarat.
Option 2: NH5 and NH7 - NH5 runs from Chennai in Tamil Nadu to Kolkata in West Bengal, while NH7 runs from Varanasi in Uttar Pradesh to Kanyakumari in Tamil Nadu. This pair of National Highways does not cross Andhra Pradesh, Karnataka, and Maharashtra.
Option 3: NH6 and NH7 - NH6 runs from Hazira in Gujarat to Kolkata in West Bengal, while NH7 runs from Varanasi in Uttar Pradesh to Kanyakumari in Tamil Nadu. This pair of National Highways does not cross Andhra Pradesh, Karnataka, and Maharashtra together.
Option 4: NH7 and NH9 - NH7 runs from Varanasi in Uttar Pradesh to Kanyakumari in Tamil Nadu, and it passes through Andhra Pradesh, Karnataka, and Maharashtra. NH