You are designing a schema for a table that will be moved from MySQL to Cloud Bigtable. The MySQL table is as follows:
How should you design a row key for Cloud Bigtable for this table?
A. Set Account_id as a key.
B. Set Account_id_Event_timestamp as a key.
C. Set Event_timestamp_Account_id as a key.
D. Set Event_timestamp as a key.
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