A D flip-flop utilizing a PGT clock is in the CLEAR state. Which of the following input actions will cause it to change states?

• CLK = NGT, D = 0
• CLK = PGT, D = 0
• CLOCK NGT, D = 1
• CLOCK PGT, D = 1
• CLK = NGT, D = 0, CLOCK NGT, D = 1