Which is the correct example of a JSON object with name, age, and city?

a$.\{$ "record"$=\{"$name$"$:"Alex", "age":$21,$ "city":"London"$\}\}$

b$.\{$ "record":$\{"$name$"$:"Alex", "age":$21,$"city":"London"$\}\}$

c$.\{$record:$\{"$name$"$:"Alex", "age":$21,$"city":"London"$\}\}$

d$.\{$ "record":$\{"$name$"$:Alex, "age":$21,$ "city":London$\}\}$

e$.$ None of the above