The two options that an architect should recommend for UC to roll out the Salesforce1 mobile app and make it accessible from any location are:

Relax the IP restriction with a second factor in the Connected App settings for Salesforce1 mobile app. This option allows UC to enable two-factor authentication (2FA) for the Salesforce1 mobile app, which requires users to verify their identity with a second factor, such asa verification code or a mobile app, after entering their username and password. By enabling 2FA in the Connected App settings, UC can relax the IP restriction for the Salesforce1 mobile app, as users can access it from any location as long as they providethe second factor.

Relax the IP restrictions in the Connected App settings for the Salesforce1 mobile app. This option allows UC to disable or modify the IP restriction for the Salesforce1 mobile app in the Connected App settings, which control how userscan access a connected app, such as Salesforce1. By relaxing the IP restrictions, UC can allow users to access the Salesforce1 mobile app from any location without requiring 2FA.

The other options are not recommended for this scenario. Removing existing restrictions on IP ranges for all types of user access would compromise security and compliance, as it would expose Salesforce to unauthorized access from any location. Using Login Flow to bypass IP range restriction for the mobile app would require custom code and logic, which could introduce complexity and errors. References: [Connected Apps], [Two-Factor Authentication], [Require a Second Factor of Authentication for Connected Apps], [IP Restrictions for Connected Apps], [Login Flows]