Which of the following is the correct relationship between speed of light in vacuum and frequency of light?

• A. c=f‚âà√≠¬¨‚Ñ¢
• B. c=f
• C. ‚âà√≠¬¨‚Ñ¢=cf
• D. c=‚âà√≠¬¨‚Ñ¢2