DRAG DROP
Your company uses Microsoft SharePoint Online. You create a subsite in an existing site collection. The subsite
will serve as a document repository from which anyone can download documents. External sharing is turned off
globally.
You plan to share documents with users by emailing document links. Users must not be required to sign in to
the subsite to download the documents.
You need to configure the environment to allow document sharing with external users.
Which three actions should you perform in sequence? To answer, move the appropriate actions from the list of
actions to the answer area and arrange them in the correct order.
Select and Place:
Answer: 
Explanation:
Step 1. To be able to share documents, we first need to enable sharing at the top level, the Tenant.
The question states: “You plan to share documents with users by emailing document links. Users must not be
required to sign in to the subsite to download the documents”.
To do this, we need to select the following sharing option:
“Allow both external users who accept sharing invitations and guest links”.
Step 2. The second step is to allow sharing at the Site Collection level.
Again, we need to configure the following sharing option:
“Allow both external users who accept sharing invitations and guest links”.
Step 3. The final step after sharing has been enabled is to share the required documents.https://support.office.com/en-in/article/Manage-external-sharing-for-your-SharePoint-Online-environmentc8a462eb-0723-4b0b-8d0a-70feafe4be85
This is correct. I questioned box 3 but you can’t share a whole subsite without them logging in. It has to be done for each document.
I do not think there is such thing as enabling (or disabling) sharing for a document. You just share it as needed (if steps 1 and 2 are done as in the answer).