Final Answer:
Use the designated ".py" script to backfill gaps.
Step-by-step explanation:
File Extension (.py):
The ".py" file extension is a common convention for Python script files. In the context of programming, ".py" files contain Python code and are executed by the Python interpreter.
Backfilling Gaps:
The instruction suggests utilizing a Python script to backfill gaps in a process or data. Backfilling typically involves filling in missing or incomplete data, and using a Python script allows for automation and efficient handling of such tasks.
Script Usage (Option A):
The placeholder in the sentence is appropriately filled with "designated," emphasizing the specificity of the Python script needed for the backfilling process.
Therefore, the correct instruction is to use the designated ".py" script to backfill gaps.