Which of the following summarizes the important features of ECL?

• Low noise margin, low output voltage swing, negative voltage operation, fast, and high power consumption
• Good noise immunity, negative logic, high frequency capability, low power dissipation, and short propagation time
• Slow propagation time, high frequency response, low power consumption, and high output voltage swings
• Poor noise immunity, positive supply voltage operation, good low frequency operation, and low power