Choose Python objects that will be the same after conversion to JSON and back.
a)
{42: "Life, the Universe, and Everything"}
b)
[{"race": "elf", "class": "bard"}, {"race": "dwarf", "class": "monk"}]
c)
{"decimal": 10, "binary": 1010, "hexadecimal": "A"}
d)
{True: ["Water is wet", "Earth revolves around the Sun"], False: ["We live on Jupiter", "x is not equal to x"]}
Tip: Check the type of keys in the dictionary.