Final answer:
b) January 2017. The registration process for DMS in Ontario became law in January 2017, requiring sonographers to meet specific education and certification requirements.
Step-by-step explanation:
The registration process for DMS (Diagnostic Medical Sonographer) became law in Ontario in January 2017. Prior to this, there were no regulations in place for sonographers in Ontario. With the passage of the law, sonographers are now required to meet specific education and certification requirements to practice in the province.