The correct answer is option 3. Here is a rundown of each option for a better understanding:

Option 1 suggests that all three statements are correct. However, this is not the case. Although India does indeed have over 1.3 lakh post offices, Bharat Sanchar Nigam Limited (BSNL) was formed in the year 2000, not 1997. Similarly, the Telecom Regulatory Authority of India (TRAI) was established in 1997, not 2000.

Option 2 suggests that only the first two statements are correct. While it is true that India has over 1.3 lakh post offices, BSNL was not formed in 1997, which makes this option incorrect.

Option 3, which is the correct answer, posits that only the first statement is true. Indeed, India does have over 1.3 lakh post offices.

Option 4 asserts that only the third statement is true. However, this is incorrect because TRAI was actually established in 1997, not 2000.