Which statement correctly describes the relation between a device and a measuring component?

Which statement is true about specifications?

Your client has three requirements:
1. Apply validations on meter reads coming from the Data Collectors.
2. If a meter read does not pass the validation, an error will be generated and assigned to a user.
3. Retry the validation every 30 minutes for the errors in case the issue is related to configuration.
Which statement describes the base functions you should use?

What can cause a bill segment to have multiple bill calculation headers?

Your client has the following requirements:
Many customers are installing their own solar electrical generation equipment. When these customers generate more electricity than required for their own use, the surplus can he exported back to the power grid.
In order to measure this generation, we have installed special scalar devices. These devices have separate registers to measure the energy generated (export) and the energy received (import) from the National Grid. Both reads will be stored in kWh, but the import is subtractive and export is consumptive.
What solution should you choose to configure the measuring component types for these specific requirements?