Which of the following is correct with respect to above Python code ?

d = {"a" : 3,"b" : 7}

1. a dictionary d is created.
2. a and b are the keys of dictionary d.
3. 3 and 7 are the values of dictionary d.
4. All of these.

What would the following code print ?

d = {'spring':'autumn','autumn':'fall','fall':'spring'}
print(d['autumn'])

1. autumn
2. fall
3. spring
4. Error

What is printed by the following statements ?

D1 = {"cat":12,"dog":6,"elephant":23,"bear":20} 
print(25 in D1)

1. True
2. False
3. Error
4. None

What will be the result of the following code ?

d1 = {"abc":5,"def":6,"ghi":7} 
print(d1[0])

1. abc
2. 5
3. {"abc":5}
4. Error