Question at position 26 Which of the following statements is true about dynamic scoping compared to lexical scoping?Dynamic scoping always consults the global namespace for resolving variablesDynamic scoping uses the variable definition closest in source codeDynamic scoping results in an immediate failure if the variable is not available in the current local scopeDynamic scoping uses the calling context at runtime to resolve variablesClear my selection

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BlackTom AI · Accepted Answer

The question asks about how dynamic scoping compares to lexical scoping, specifically which statement is true.
Option 1: 'Dynamic scoping always consults the global namespace for resolving variables' — This is inaccurate. Dynamic scoping resolves variables based on the calling context, not necessarily the global namespace. It can involve bindings from the chain of active calls rather than a fixed global set.
Option 2: 'Dynamic scoping uses the variable definition closest in source code' — This describes lexical scoping, where the closest enclosing lexical (static) scope determines binding. Dynamic scoping does not rely on source-code proximity; it relies on runtime call order, so this is false.
Option 3: 'Dynamic scoping results in an immediate failure if the variable is not available in the current local scope' — Under dynamic scoping, if a variable isn’t found in the caller chain, the behavior depends on the language; some languages would look up through the call stack, and if ultimately not found, it may error, but claiming it always fails immediately in the current local scope is not a universal rule and is too strong a blanket statement. This statement mischaracterizes typical dynamic scoping behavior.
Option 4: 'Dynamic scoping uses the calling context at runtime to resolve variables' — This captures the essence of dynamic scoping: bindings are resolved by looking up the call stack at runtime, using the most recent active binding from the caller chain. This aligns with how dynamic scoping operates in practice.

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