$1$ Our trusted, multitenant cloud means you get:

The benefits of the same core set of features for all customers

Upgrades three times a year

No software to install to access Salesforce

All of the above

$2$ The Salesforce API is:

Like a contract between two pieces of software, allowing them to connect and exchange information

Not available for certain technologies such as wearables

The exact same thing as an API name

Only for programmers to use