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Just want to from which API can I create a dependent task? , A, B,C,D like these are my task and D task need  to be executed when A and B task fails and C task will be executed with the input results of A and B.

You can set D as having A and B as upstream tasks, along with a trigger for it to execute when A and B fail (maybe `all_failed` or `any_failed`). For C, you just write it with the results of A and B as arguments.

<@U01DJDK6AQ7> ! Gone through the examples. Worked perfectly! But not able to pass the argument  while using upstream.

I suggest showing a simplified code example here, then someone might be able to help you get it to work.

Could you show me what you tried? I can see why it would be tricky