You are developing an ecommerce application that stores customer, order, and inventory data as relational tables inside Cloud Spanner. During a recent load test, you discover that Spanner performance is not scaling linearly as expected. Which of the following is the cause?

A. The use of 64-bit numeric types for 32-bit numbers. B. The use of the STRING data type for arbitrary-precision values. C. The use of Version 1 UUIDs as primary keys that increase monotonically. D. The use of LIKE instead of STARTS_WITH keyword for parameterized SQL queries.