The key requirement is to calculate arunning total of distinct IP addressesover time, which involves both aggregation (stats dc(clientip) by _time) and cumulative calculation (streamstats dc(ipa) as "Cumulative total").

Option Acorrectly bins events by day (bin _time span=1d), calculates distinct counts (dc(clientip)) per day, and then applies streamstats to compute the running (cumulative) count across the timeline.

Option Bcalculates daily distinct counts but does not provide a running total.

Option Csimply formats a table without aggregation.

Option Daggregates by user, not by day, and misses cumulative counts.

TheSplunk Search Manualrecommends using streamstats with distinct count fields to obtain running totals for time series data.