Determine if f left parenthesis x right parenthesis is continuous at x equals 6. If not, select the option with the correct reasoning as to why not. A.) Not continuous at x equals 6 because limit as x rightwards arrow 6 of f left parenthesis x right parenthesis not equal to f left parenthesis 6 right parenthesis B.) Not continuous at x equals 6 because limit as x rightwards arrow 6 of f left parenthesis x right parenthesis does not exist C.) Continuous at x equals 6 D.) Not continuous at x equals 6 because f left parenthesis 6 right parenthesis is undefined