The correct answer is: d) All of the above.
Visakhapatnam and Vijayawada are the two largest cities in Andhra Pradesh, with populations of over 3 million and 2 million, respectively. They are both major industrial and commercial centers, and offer a wide range of employment opportunities. Tirupati is a major religious pilgrimage site, and attracts millions of visitors each year. Guntur is a major agricultural center, and is home to a number of educational institutions. Kurnool and Nellore are both important commercial centers, and are located on major transportation routes.
All of these cities offer a number of advantages to migrants, including employment opportunities, access to education and healthcare, and a variety of cultural and recreational activities.