How are network policies defined in Snowflake?

They are a set of rules that define the network routes within Snowflake.

They are a set of rules that dictate how Snowflake accounts can be used between multiple users.

They are a set of rules that define how data can be transferred between different Snowflake accounts within an organization.

They are a set of rules that control access to Snowflake accounts by specifying the IP addresses or ranges of IP addresses that are allowed to connectto Snowflake.