In the following stack declaration, what is the stack size?

$\backslash$table$[[$stack $=[],$ # Array stack implementation,$],[$stack$.$append$(12),$# Push on top of stack$],[$stack$.$append$(2),$# Push on top of stack$],[$stack$.$append$(34),$# Push on top of stack$],[$stack$.$append$(11),$# Push on top of stack$]]$

$[$ Select $]$