An Amazon DynamoDB table called SensorReadings captures sensor readings. These readings include a sensor ID attribute that acts as the partition key, and a timestamp attribute that is the sort key. Which statement is true?The sensor ID together with the timestamp represent a simple primary key.It is impossible for two items in the SensorReadings table to have the same partition key.It is impossible for two items in the SensorReadings table to have the same sort key.It is impossible for two items in the SensorReadings table to have the same primary key.