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When designing a Bigtable schema with several groups of columns that are frequently used together, how should you organize these groups to optimize read performance according to Google Cloud's best practices?
A
Define a separate row key for each group.
B
Create secondary indexes that include all columns in a group, one for each group.
C
Place each group of related columns in a separate table.
D
Group related columns into a column family within a single table.
