Coefficient, operator, variable are the groups of terms whose domain is specific to algebra. Hence, option A is correct.
Algebra is a branch of study of mathematics that involves the study of numerical and fractions in different ways to derive solutions. Algebra generally works upon formula and equations.
Algebra involves the use of numerical variables like x and y; the use of coefficients along with the variables and also the operators while writing and simplifying algebraic expressions.
Hence, option A holds true regarding algebra.
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