What is the general formula for finding the shortest distance between two parallel lines given by ax+by+c1=0 and ax+by+c2=0?

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2019/06/line-point-distance-multiple-choice-questions-answers-mcqs-q2a.png"><img alt="Shortest distance between two parallel lines is ax+by+c1=0 &amp; ax+by+c2=0 - option a" class="size-full wp-image-241912" height="51" src="https://www.sanfoundry.com/wp-content/uploads/2019/06/line-point-distance-multiple-choice-questions-answers-mcqs-q2a.png" width="82"/></a>
• B. <a href="https://www.sanfoundry.com/wp-content/uploads/2019/06/line-point-distance-multiple-choice-questions-answers-mcqs-q4b.png"><img alt="Shortest distance between two parallel lines is ax+by+c1=0 &amp; ax+by+c2=0 - option c" class="size-full wp-image-241915" height="49" src="https://www.sanfoundry.com/wp-content/uploads/2019/06/line-point-distance-multiple-choice-questions-answers-mcqs-q4b.png" width="70"/></a>
• C. <a href="https://www.sanfoundry.com/wp-content/uploads/2019/06/line-point-distance-multiple-choice-questions-answers-mcqs-q4c.png"><img alt="Shortest distance between two parallel lines is ax+by+c1=0 &amp; ax+by+c2=0 - option c" class="size-full wp-image-241916" height="57" src="https://www.sanfoundry.com/wp-content/uploads/2019/06/line-point-distance-multiple-choice-questions-answers-mcqs-q4c.png" width="71"/></a>
• D. c1+c2