You Need to Create a New Transaction Table in Cloud

Multiple Choice

You need to create a new transaction table in Cloud Spanner that stores product sales data. You are deciding what to use as a primary key. From a performance perspective, which strategy should you choose?

A) The current epoch time
B) A concatenation of the product name and the current epoch time
C) A random universally unique identifier number (version 4 UUID)
D) The original order identification number from the sales system, which is a monotonically increasing integer