Which of the following statements is not true? (a) GDP of India is calculated by the state

Which of the following statements is not true?
(a) GDP of India is calculated by the state government of the largest Indian state.
(b) Calculating GDP is a massive task.
(c) GDP shows the level of development of an economy.
(d) GDP is the value of all final goods and services that are produced in a country
during one financial year.​