Which best describes the availability of substitutes in a monopoly?

Technician a says that the sine with dwell (swd) test is used to determine if an electronic stability control system functions normally. technician b says that the esc lamp, called a telltale light, is required to remain on for two minutes. who is correct?

Which statement best summarizes the outcome of the haitian revolution? a. french colonists agreed to remain in haiti to the new countryplan its government. b. france gave up control of haiti, but it forced haitian leaders toallow slavery to continue. c. haiti established a short-lived democratic government, but it wassoon colonized again by spain. d. haiti became independent from france, but the fightingdevastated its economy.

Brainliesttt !me : ) what brought about the end of the soviet union?