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The main difference between a TON and TOF timer is that the: Select one: a. TON timer can maintain its accumulated time on loss of power or logic continuity. b. TOF timer can maintain its accumulated time on loss of power or logic continuity. c. TOF timer begins timing when logic continuity to the timing rung is lost. d. TON timer begins timing when logic continuity to the timing rung is lost. The off-delay timer (TOF) starts timing when the timer's: Select one: a. ladder rung switches from false to true. b. ladder rung switches from true to false. c. accumulated value equals its preset value d. accumulated is greater than its preset value