A point which is outside of the lower control limit on an R$-$chart:

Multiple Choice

its

$00$:$58$:$20$

should be ignored because it signifies very low process variation.

is an indication that no process variation is present.

should be ignored unless another point is outside that limit$.$

should be investigated because it could indicate improvements in the methods used in a process.

is impossible because the lower limit is always zero.