The field (e) of a uniformly charged straight wire of length ℓ at point P, a perpendicular distance x from its midpoint, is given by e = (λ / (2πε₀)) * (ℓ / sqrt(ℓ² + 4x²)). What is the expression for the electric field?

a) (λ / (2πε₀)) * (ℓ / sqrt(ℓ² + 4x²))
b) (λ / (4πε₀)) * (ℓ / sqrt(ℓ² + 2x²))
c) (λ / (πε₀)) * (ℓ / sqrt(ℓ² + x²))
d) (λ / (πε₀)) * (ℓ / sqrt(ℓ² - x²))