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QUESTION 4 We created a global variable called sysTicks that gets incremented in the sysTicks_handler interrupt every Ims. It can be used to keep track of time. Four methods of blinking an LED at 20 Hz are shown. Which one minimizes the use of the CPU so that it can be used for other tasks more efficiently? A B void blinkLED (void) { ledon(); delay_ms (25); ledoff(); delay_ms (25); } void blinkLED (void) { systicks=0; ledon (); while (systicks