Which of the following is a valid PromQL query?

PromQL does not use SQL-like keywords such as `SELECT * from` or `WHERE` for querying metrics.

This syntax mixes the metric name with a `WHERE` clause, which is not valid PromQL; label selectors are enclosed in curly braces.

PromQL does not use `SELECT * from`; a metric name alone like `http_requests_total` is a valid basic query, but `SELECT * from` is incorrect syntax.

In PromQL, metric selectors use curly braces `{}` to specify label matchers. `http_requests_total` selects the metric, and `{job="apiserver"}` filters the results to only include those where the `job` label has the value `apiserver`, which is the correct syntax for a metric selector.