A data engineer needs to dynamically create a table name string using three Python variables: region, store, and year. An example of a table name is below when region = "nyc", store = "100", and year = "2021": nyc100_sales_2021. Which of the following commands should the data engineer use to construct the table name in Python?
a) table_name = region + store + "sales" + year
b) table_name = f"{region}{store}sales{year}"
c) table_name = region . store . "sales" . year
d) table_name = "{}{}sales{}".format(region, store, year)