Explanation:

- The Consumer Protection Act, 1986 established the District Consumer Disputes Redressal Forum to handle consumer complaints.

- Each level of the consumer dispute redressal system has a limit on the value of claims it can address.

- Option 1: Rs 5 lakh - This was not the limit under the original act for district forums.

- Option 2: Rs 15 lakh - Also not a correct historical limit for district forums under the 1986 act.

- Option 3: Rs 20 lakh - This is the correct maximum limit for claims to be filed in the District Forum as per the Consumer Protection Act, 1986.

- Option 4: Rs 10 lakh - In earlier versions of the act, the district forum did handle claims up to this amount, but it was later increased.