What is the focus of the ISO 15189 standard?

The ISO 15189 standard focuses on ensuring the quality and competence of results in clinical laboratories.
The ISO 15189 standard focuses on improving the efficiency of operational processes in organizations of any type or size.
The ISO 15189 standard focuses on promoting effective communication both internally and externally in organizations.
a) Only statement I is correct.
b) Only statement II is correct.
c) Only statement III is correct.
d) Statements I and III are correct.
e) Statements II and III are correct.