Using properties, determine if a combination of functions is continuous. Using the properties of combinations of continuous functions, determine the interval(s) over which the function f left parenthesis x right parenthesis equals fraction numerator x squared minus 5 x minus 6 over denominator x minus 3 end fraction is continuous. A.) left parenthesis negative infinity comma space 3 right parenthesis union left parenthesis 3 comma space infinity right parenthesis B.) left parenthesis short dash infinity comma infinity right parenthesis C.) left parenthesis short dash infinity comma space short dash 1 right parenthesis union left parenthesis short dash 1 comma space 3 right parenthesis union left parenthesis 3 comma space 6 right parenthesis union left parenthesis 6 comma space infinity right parenthesis D.) left parenthesis short dash infinity comma space short dash 1 right parenthesis union left parenthesis short dash 1 comma space 6 right parenthesis union left parenthesis 6 comma space infinity right parenthesis