Which of the following is an example of a process that uses Six Sigma techniques? More than one answer may be selected.

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A tutoring center requires all students to score $100$ percent on a cumulative test before moving on to the next level; materials are not unlocked for their username$/$password until such a score has been achieved.

A dentist office has dental hygienists use premeasured teeth polisher to reduce the amount of pollisher they need to buy.

A clothing manufacturer only orders from supply partners who can meet their specified delivery windows.

A food manufacturer that sells canned goods has a manufacturing process in place that will not factory seal and label cans until the desired weight has been confirmed to be within $\mathrm{.}01oz$ of the desired weight.