For the constant function $f(x) = 3$ defined on $\mathbb{R}$, the **range** is:
A$\mathbb{R}$
B$[0, 3]$
C$\{0\}$
D$\{3\}$
Answer & Solution
Correct answer: D. $\{3\}$
Every input maps to $3$, so the range is the singleton $\{3\}$.
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