The correct answer is Algorithm

• Algorithm
  • ​It is a problem-solving rule or procedure that when followed step by step, assures that a correct solution will be found.
  • It is one of the strategies of problem-solving.
  • It helps in finding the correct solution to any problem through a step-by-step process.
  • Its outcomes are accurate.
  • It is mostly used in computer science and even Google and Facebook use Algorithms.
  • Example: Instruction manual for installing software on a laptop.
  • Its drawback is that it is a highly time-consuming process.

• Mental-set
  • It leads to functional fixedness.
  • In this, the observer creates a tendency to see only those solutions that worked in past.
• Trial and error
  • In this, the person tries different solutions and removes those that are not working.
  • This trail goes on until the problem is not solved.
  • It is a very time-consuming process.
• Insight
  • In this, the solutions occur too quickly.
  • It can happen due to experience and consciousness.
  • The solutions through insights are more accurate.