Studies on a bottle$-$filling machine indicate that it fills bottles to a mean of $15$ ounces with a standard deviation of $0\mathrm{.}10$ ounces. What is the process specification, assuming the Cpk index of $1?$

Group of answer choices

lower spec $=0\mathrm{.}1$ ounces and upper spec $=1$ ounce

lower spec $=14\mathrm{.}3$ ounces and upper spec $=16\mathrm{.}7$ ounces

lower spec $=14\mathrm{.}1$ ounces and upper spec $=20\mathrm{.}4$ ounces

lower spec $=14\mathrm{.}7$ ounces and upper spec $=15\mathrm{.}3$ ounces

There is insufficient information to determine the process specification.