Suppose you are studying a dataset of sales by county (table 1). Unfortunately, you are missing the county codes, so you need to compare names. In your dataset, county names appear as "COOK", "KNOX", "AUTAUGA", "NEW CASTLE", etc. You want to match (join) this information with another table (table 2) where counties are named as "Cook", "Knox", "Autauga", "New Castle". Which of the following would allow you to perform the match?单项选择题

A

Keep table 1 unchanged and use tolower() in table 2.

B

Keep table 1 unchanged and use toupper() in table 2.

C

Use tolower() in table 1 and toupper() in table 2.

D

Use toupper() in table 1 and tolower() in table 2.

E

Use tolower() in table 1 and keep table 2 unchanged.

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