The correct answer is: d) Any of the above.
The Census of India uses a variety of methods for data collection, including the canvasser method, self-enumeration method, and online data submission.
The canvasser method is the traditional method of data collection, in which enumerators visit households to collect data. This method is used in rural areas and in urban areas where there is a high proportion of illiterate people.
The self-enumeration method is a newer method of data collection, in which households are given a questionnaire to complete themselves. This method is used in urban areas where there is a high proportion of literate people.
Online data submission is a relatively new method of data collection, in which households can submit their data online. This method is becoming increasingly popular, as it is convenient and easy to use.
The Census of India uses a variety of methods for data collection in order to ensure that the data is accurate and complete. The methods used are selected based on the population characteristics of the area being surveyed.