State which of the following are true and which are false. If false, explain your answers.

a) C++ operators are evaluated from left to right.

b) The following are all valid variable names: _under_bar_, m928134, t5, j7, her_sales, his_account_total, a, b, c, z, z2.

c) The statement cout << a = 5;; is a typical example of an assignment statement.

d) A valid C++ arithmetic expression with no parentheses is evaluated from left to right.

e) The following are all invalid variable names: 3g, 87, 67h2, h22, 2h.