Answer:
d. aware of other data.
Step-by-step explanation:
The natural rate of unemployment is a rate that the economy tends to assume over time. This rate is not accurate, because the economy is something very fixed that can totally change the factors of employability and expectations of employees in several different sectors of the market.
As this rate is not natural and very imprecise, it is necessary for policy makers to be aware of other economic data that can help them to formulate employability and job management policies.