Which point does the logarithm of y = 1-log (a is the base 2-x) pass?

Which point does the logarithm of y = 1-log (a is the base 2-x) pass?

(1,1)
Make the true number equal to 1. No matter what the value of a is, the logarithm is equal to 0

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(X-2 times root sign XY + y) (root sign x + root sign Y)

(X-2 times root sign XY + y) * (root sign x + root sign Y)
=(radical X - radical y) ^ 2 * (radical x + radical y)
=(X-Y) (radical X - radical y)

Let ⊕ be an operation on R, and a be a nonempty subset of R. if there is a ⊕ B ∈ a for any a, B ∈ a, then a pair operation ⊕ is said to be closed. If the following number sets are closed to addition, subtraction, multiplication and division (division is not equal to zero), then ()
A. Natural number set B. integer set C. rational number set D. irrational number set

In a, 1-2 = - 1 is not a natural number, that is, the set of natural numbers does not meet the condition; in B, 1 △ 2 = 0.5 is not an integer, that is, the set of integers does not meet the condition; in C, the set of rational numbers meets the condition; in D, π - π is not an irrational number, that is, the set of irrational numbers does not meet the condition, so select C