Which of those JSON documents can be a JSON schema?

Question

Answer

{  "type" : "object",   "additionalProperties" : false,   "properties" : {   "key1" : {"type": "string" },   "key2" : {"type": "string" }  },   "required" : ["key1"] }

Answer

{ "type" : "object",  "properties" : {  "key1" : {"type": "object" },  "key2" : {"type": "array" } },  "required" : ["key1"] }

Answer

{  "additionalProperties" : false,   "properties" : {   "key1" : {"type": "string" },   "key2" : {"type": "string" }  } }

Answer

{  "type" : "object",   "properties" : {   "key1" : {"type": "string" },   "key2" : {"type": "number" }  },   "required" : ["key1", "key2"] }

Answer

{  "type" : "object",   "properties" : {   "key1" : {"type": "string" },   "key2" : {"type": "string" }  },   "required" : ["key3"] }

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Which of those JSON documents can be a JSON schema?

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