Your customer has implemented a solution that uses Cloud Spanner and notices some read latency-related performance issues on one table. This table is accessed only by their users using a primary key. The table schema is shown below. 
You want to resolve the issue. What should you do?
A) Remove the profile_picture field from the table.
B) Add a secondary index on the person_id column.
C) Change the primary key to not have monotonically increasing values.
D) Create a secondary index using the following Data Definition Language (DDL) : 
Correct Answer:
Verified
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