A field technician is asked why corporate iPhones do not allow sales staff to install a privately developed app by tapping a direct link to an .ipa file hosted on the company intranet. The file downloads but refuses to install. Which built-in iOS design choice best explains why the installation fails?
iOS blocks any app larger than 200 MB when downloaded over Wi-Fi, regardless of its source.
iOS restricts installation of packages with an .ipa extension; apps must use .apk instead.
iOS only installs applications that are digitally signed and delivered through the App Store or a trusted enterprise certificate.
The Darwin kernel in iOS requires apps to include a SELinux context before they can launch.
iOS enforces code-signing and distribution controls. An application must be digitally signed with a certificate trusted by the device and is normally installed only through Apple's App Store. The one exception is enterprise distribution, which still requires a trusted enterprise certificate and, in most cases, mobile-device-management enrollment. Simply tapping an unsigned .ipa sideload link will fail. The other options are incorrect: file-size limits apply only to cellular downloads, iOS does not use SELinux labels, and .apk packages are for Android, not iOS.
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