执行该程序段后， 下列语句能正确输出单词"apple"出现次数的是？（ ）
words = ["apple", "pear", "apple", "apple", "keep", "day"]
dic = {}
for i in words:
if i in dic:
dic[i] = dic[i] + 1
else:
dic[i] = 1
print(dic[0])
print(dic{0})
print(dic["apple"])
print(dic{"apple"})