Often, safety inventory calculations in practice do not include any measure of supply uncertainty, resulting in levels

Question:

Often, safety inventory calculations in practice

do not include any measure of supply uncertainty, resulting in levels that may be higher than required.
do not include any measure of supply uncertainty, resulting in levels that may be lower than required.
include measures of supply uncertainty, resulting in levels that may be higher than required.
include measures of supply uncertainty, resulting in levels that may be lower than required.

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