Free points you're welcome its 50

Well Workover and Intervention

1. n. [Well Workover and Intervention] The depth at which a tubing or coiled tubing string that is stuck in the wellbore is free to move. When the tubing string must be cut to enable recovery, the free point should be known to ensure retrieval of the cut tubing.

Explanation:

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i believe the answer would be 'd'.

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its bassicly asking u   to answer it in your own words does that