Which two components are optional while creating the Monitoring Query Language (MQL) expressions in the Oracle Cloud Infrastructure (OCI) Monitoring service? (Choose two.)

In OCI Monitoring service, Monitoring Query Language (MQL) expressions follow the general structure: Metric[Interval]{Dimensions}.GroupingFunction().Statistic. While the Metric name and the spatial/temporal aggregation Statistic (e.g., mean, max, sum) are mandatory components of an MQL query, Dimensions (filters/groupings by metric dimensions) and Grouping Functions (such as groupBy()) are optional. If dimensions are omitted, the query aggregates across all telemetry streams for that metric; if grouping functions are omitted, default aggregation applies across all retrieved data streams.

A: Interval defines the aggregation window and defaults if omitted, but standard syntax constructs require specifying the evaluation time window. B: Statistic (e.g., mean, count, max) is a mandatory MQL element required to convert metric data points into aggregate output. C: Previous is a temporal modifier clause used for offset comparisons; it is not a primary syntax component evaluated as optional query parameter structure. E: Metric name specifies the target resource telemetry being queried and is strictly mandatory in every MQL expression.

Oracle Cloud Infrastructure Documentation, OCI Monitoring Service - Monitoring Query Language (MQL) Reference: Section "MQL Syntax and Clause Requirements".

Oracle Cloud Infrastructure Documentation, Building MQL Queries: Section "Optional and Required Query Components (Dimensions and Grouping Functions)".