Which statement about synchronous and asynchronous API calls is true?

Question

Options

• ASynchronous API calls wait to return until a response has been received.
• BSynchronous communication is harder to follow and troubleshoot.
• CSynchronous API calls must always use a proxy server.
• DAsynchronous communication uses more overhead for client authentication.

• A
  89% (25)
• C
  4% (1)
• D
  7% (2)

Explanation

Option A is correct because synchronous API calls block execution - the caller sends a request and halts until the server responds before continuing. This "blocking" behavior is the defining trait of synchronous communication.

Why the distractors are wrong:

• B is backwards - synchronous calls are actually easier to follow and troubleshoot because execution flows linearly and errors surface immediately.
• C is fabricated - synchronous calls have no requirement to use a proxy server; that's an architectural choice unrelated to sync/async behavior.
• D is also fabricated - authentication overhead is determined by the auth mechanism (OAuth, API keys, etc.), not whether communication is sync or async.

Memory tip: Think of synchronous like a phone call - you wait on the line until the other person answers and responds. Asynchronous is like sending a text - you fire it off and move on, checking back later for a reply.

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