Explanation
To pass the email address of a subscriber to a landing page through a URL parameter from a promotional email securely, the admin should use the CloudPagesURL AMPscript function. This function encrypts the email address and other parameters and generates a unique URL for each subscriber. The landing page can then use the RequestParameter AMPscript function to decrypt the email address and other parameters

Explanation
Three Filter Activities and three Send Activities to the filtered audiences are the steps that should be included in the customer's automation. Filter Activities are used to segment a data extension based on specific criteria, such as the member's renewal date. Send Activities are used to send an email to a data extension or a filtered audience.

Explanation
AMPscript conditional against the Gender field is the best method to ensure content is displayed properly within the email. It allows creating dynamic content based on the value of the Gender field in the sendable data extension. Dynamic Content Wizard is not suitable for this scenario because it requires creating content areas for each variation of content, which can be cumbersome for a customer with limited technical resources.
AMPscript lookupRows functions and A/B Test content type are not relevant for this scenario.

Explanation
To achieve the setup of sharing the same SFTP directory across each of their Marketing Cloud accounts, NTO should copy the parent SFTP user into each child business unit. This will allow each business unit to access the same SFTP directory as the parent business unit and share files among them. The other options are incorrect because:
Child business unit SFTP user should be created. This will create a separate SFTP user and directory for each child business unit, which will not allow them to share files with the parent business unit or other child business units.
Each business unit should have multiple SFTP users. This will create unnecessary complexity and confusion for NTO, as they will have to manage multiple SFTP users and directories for each business unit. This will also not allow them to share files among different business units easily.
All child business units should have an individual SFTP user. This is similar to the first option, as it will create a separate SFTP user and directory for each child business unit, which will not allow them to share files with the parent business unit or other child business units.