Which parameter can be used to specify the caching policy for cached results in Looker?

The parameter that can be used to specify the caching policy for cached results in Looker is "persist_for." This parameter allows developers to define how long cached results should be retained before they expire. When set, it ensures that Looker serves cached data only if it is still valid, improving query performance by avoiding unnecessary computations for frequently requested data. By controlling the duration for which results are cached, analysts can benefit from faster access to data while ensuring that any changes in the underlying data are reflected in a timely manner once the cache expires.

In contrast, the other options do not have the same specific role in controlling the caching duration for results. For example, "data_control" is related to managing user access and permissions on the data level, while "max_cache_limit" and "cache_timeout" do not directly relate to persisted caching policies in the same way as "persist_for."