Choose the suitable option to fill in the blanks and complete the format of the formal letter appropriately.

4 October 2022
Mr. Aman Mittal
Director
Softel Technologies, Delhi

Dear Sir
This is with reference to your earlier letter.

i. Sender's address ii. Subject line

The correct answer is Option (2) → i. Sender's address ii. Subject line

Explanation:
- In a formal letter, the sender's address is typically included at the beginning of the letter to provide the recipient with contact information and to establish the sender's identity.
- The subject line, which indicates the purpose or topic of the letter, comes after the recipient's address and before the salutation.
- In the given letter format, "4 October 2022" is the date, "Mr. Aman Mittal" is the recipient's name, "Director" is the recipient's designation, and "Softel Technologies, Delhi" is the recipient's address, thus making it the sender's address.
- The phrase "Dear Sir" is the salutation, which comes after the subject line.