Which of the following formulas is used to calculate the criticality index, or RPN$,$ in an FMECA?

A$)$ Criticality $=$ Probability $$ Seriousness $$ Detection

B$)$ Criticality $=$ Performance $+$ Strategy $+$ Deployment

C$)$ Criticality $=$ Probability $+$ Seriousness $+$ Detection

D$)$ Criticality $=$ Personality $$ Satisfaction $$ Direction