Let $$N^+$$ be the set of positive integers and $$f:N^+\rightarrow N^+$$ be a mapping defined by $$f(x)=2x, x\in N^+$$. Then mapping $$f$$ is​

Correct option is A

​$$\textbf{Given: } f: \mathbb{N}^+ \to \mathbb{N}^+, \quad f(x) = 2x \\[6pt]\textbf{Injective:} \\f(x_1) = f(x_2) \Rightarrow 2x_1 = 2x_2 \Rightarrow x_1 = x_2 \Rightarrow \text{Injective} \\[6pt]\textbf{Surjective:} \\\text{Range of } f = \{2, 4, 6, 8, \dots\} \subset \mathbb{N}^+ \\\text{Odd numbers like } 1, 3, 5, \dots \text{ are not in the range} \\\Rightarrow \text{Not surjective} \\[6pt]\boxed{\text{Final Answer: (A) Injective}}$$​​