Which statement is a valid dictionary declaration in Python?

stock $=\{$name$$ : $$GM$,$shares$$ : $100,$price$$ : $314\mathrm{.}59\}$

stock $=\{$name$=$GM$,$shares$=100,$price$=314\mathrm{.}59\}$

stock $=[$name$$ : $$GM$,$shares$$ : $100,$price$$ : $314\mathrm{.}59]$

stock $=[$name$=$GM$,$shares$=100,$price$=314\mathrm{.}59]$