The D Flip Flop implementation for PFD is:

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-phase-lock-loops-q12a.png"><img alt="The D Flip Flop implementation for PFD - option a" class="alignnone size-full wp-image-162037" height="366" sizes="(max-width: 316px) 100vw, 316px" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-phase-lock-loops-q12a.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-phase-lock-loops-q12a.png 316w, https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-phase-lock-loops-q12a-259x300.png 259w" width="316"/></a>
• B. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-phase-lock-loops-q12b.png"><img alt="The D Flip Flop implementation for PFD - option b" class="alignnone size-full wp-image-162038" height="361" sizes="(max-width: 305px) 100vw, 305px" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-phase-lock-loops-q12b.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-phase-lock-loops-q12b.png 305w, https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-phase-lock-loops-q12b-253x300.png 253w" width="305"/></a>
• C. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-phase-lock-loops-q12c.png"><img alt="The D Flip Flop implementation for PFD - option c" class="alignnone size-full wp-image-162039" height="377" sizes="(max-width: 311px) 100vw, 311px" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-phase-lock-loops-q12c.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-phase-lock-loops-q12c.png 311w, https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-phase-lock-loops-q12c-247x300.png 247w" width="311"/></a>
• D. None of the mentioned