Explanation

"Pakistan Electronic Media Regulatory Authority" is correct as PEMRA stands for Pakistan Electronic Media Regulatory Authority. "Pakistan Entertainment Media Regulatory Agency" is incorrect because it uses 'Entertainment' instead of 'Electronic'. "Public Electronic Media Regulation Authority" is incorrect because the full name includes 'Pakistan' and specifies 'Media Regulatory Authority'. "Pakistan Electronic Media Registration Authority" is incorrect because it uses 'Registration' instead of 'Regulatory'.