You are designing a schema for a Cloud Spanner customer database. You want to store a phone number array field in a customer table. You also want to allow users to search customers by phone number. How should you design this schema?

【单选题】
A Create a table named Customers. Add an Array field in a table that will hold phone numbers for the customer.
B Create a table named Customers. Create a table named Phones. Add a CustomerId ?eld in the Phones table to find the CustomerId froma phone number.
C Create a table named Customers. Add an Array field in a table that will hold phone numbers for the customer. Create a secondary index on the Array field.
D Create a table named Customers as a parent table. Create a table named Phones, and interleave this table into the Customer table. Create an index on the phone number field in the Phones table.

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