Which of the following radiations has the least wavelength?

Wavelength order in electromagnetic spectrum:Radio $>$ Microwave $>$ Infrared $>$ Visible $>$ UV $>$ X-rays $>$ $\gamma$ -rays.Therefore, $\gamma$ -rays have the shortest wavelength.Note: $\alpha$ and $\beta$ are particles, not electromagnetic radiations (though $\gamma$ is). Among the choices, $\gamma$ -rays have the highest frequency and lowest wavelength.