500 individuals tested a new biometric security system for site entry verification. 200 were authorized users, and 300 were not. At a specific threshold, the system mistakenly shut out 10 authorized users and admitted 2 unauthorized individuals. Work out the False Non-Match Rate (FNMR) of this system at this threshold. Provide your answer in percentage rounded to two decimal places.
a) 0.50%
b) 0.67%
c) 5.00%
d) 6.67%
