The doctrine requires that "the state facilitate and not discriminate against speech by requiring public property be available for 'uninhibited, robust, and wide-open' discussion and debate on matters of public and societal importance."

Public forum.

Explanation:

'Public forum doctrine' is demonstrated as the precept that is used as an analytical tool to determine the integrity of speech limitations enacted on the government's property. This doctrine assists the courts to determine whether the groups possess an access to involve in expressive activities in association to such properties. It proposes certain restrictions on the speech and regulates them when it is expressed or delivered at the government's property. Thus, 'public forum doctrine' is the correct answer.

this statement is true.

forests are public goods, available for everybody. when usage of such a good becomes interesting for consumers and its usage increases, there can be a risk of overexploitation. it is a non rival good therefore, if one person consumes the good it does not reduce the availability for subsequent consumers.

these caracteristics require the establishment of measures in order to prevent the destruction of a commonly owned space, for example, to restrict the amount of people that have access to the same time.

  b.

there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.