If module A declares a dependency upon Module B, which of the following is not valid to declare such dependency?

[dmitrii_fediuk]

• In Module A’s module.xml file, Module B is listed in the <sequence> list
• declare a dependency upon Module B in A’s composer.json
• declare a dependency upon Module A in B’s composer.json
• in the deployment configuration, Modules A and B must both be defined as enabled.

devdocs.magento.com/guides/v2.0/architecture/archi_perspectives/components/modules/mod_depend.html#managing-module-dependencies