4. Which of the following variable names are valid?
a. 123variable
No.
b. x
Yes.
c. total_score
Yes.
d. Weight_in_#s
No.
e. one
Yes.
f. gross-cost
No.
g. RADIUS
Yes.
h. Radius
Yes.
i. radius
Yes.
j. this_is_a_variable_to_hold_the_width_of_a_box
Yes.
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