39 in a dataflow diagram (dfd), a(n) ___________ portrays the transformation of data.

I'm working with real estate data sets. I have CSV files that contain a bunch of info on properties in different cities. It's all pretty much the same info, but different field names, different address formats, sometimes instead of one CSV the info I need is split into two files, etc. Some of these files have millions of records and dozens of fields in a single file. My goal is to bring them together into a database or something that has owner name, addresses, city, state, zip, home value, year... Yes. Our services are very confidential. All our customer data is encrypted. We consider our client’s security and privacy very serious. We do not disclose client’s information to third parties. Our records are carefully stored and protected thus cannot be accessed by unauthorized persons. Our payment system is also very secure.

so far my pipeline code (inside main) is: `Pipeline p = Pipeline.create(PipelineOptionsFactory.fromArgs(args).withValidation().create());` `PCollection<String> lines = p.apply("ReadLines",` [`TextIO.read`](https://TextIO.read)`().from("gs://bucket/data.csv"));` `PCollection<String> grouped_lines = lines.apply(GroupByKey())` `PCollection<java.lang.Long> count = grouped_lines.apply(Count.globally());` [`p.run`](https://p.run)`();` however I only want to get the count for o...

In a dataflow diagram (dfd), a(n) ___________ portrays the transformation of data.

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