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You are parsing a log file that contains three columns: a timestamp, an account number...

You are parsing a log file that contains three columns: a timestamp, an account number (a string), and a

transaction amount (a number). You want to calculate the sum of all transaction amounts for each unique

account number efficiently.

Which data structure should you use?

A.

A linked list

B.

A hash table

C.

A two-dimensional array

D.

A comma-delimited string

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