The mass of an unknown substance is 3.86 g. Which of the following sets of measurement represents the value with both accuracy and precision?

a:

3.85 g, 3.86 g, 3.84, 3.81 g

b:

3.81 g, 2.98 g, 3.40 g, 3.78 g

c:

2.98 g, 3.02 g, 2.96 g, 3.01 g

d:

2.78 g, 2.80 g, 2.76g, 2.81 g