Which definition describes the term “overclocking”?

Which definition describes the term “overclocking”?

• modifying the motherboard clocking crystal to increase the timing signals
• changing the bus speed of the motherboard to increase the speed of attached adaptors
• replacing slower SDRAM with faster memory
• increasing the speed of the CPU beyond the recommendations of the manufacturer
  

  Answers Explanation & Hints: Increasing the CPU clock speed will make the computer run faster, but also generate more heat and cause overheating issues.