Negation of the statement $\forall x \in \mathbb{R}, x^2+1=0$ is

• A
  $\exists x \in \mathbb{R}$ such that $x^2+1 < 0$
• B
  $\exists x \in \mathbb{R}$ such that $x^2+1 \leq 0$
• C
  $\exists x \in \mathbb{R}$ such that $x^2+1 \neq 0$
• D
  $\exists x \in \mathbb{R}$ such that $x^2+1=0$