Get Other columns based on max of one column in Kusto - azure-data-explorer

Question

I am trying to write a Kusto query to find record who has max value in column grouped by another column but also requires 3rd(remaining) columns with it.
Let there be three columns A(timestamp) B(impvalue: number) and C (anothervalue:string).
I need to get records grouped by C with max timestamp and its corresponding B column too.
In Sql, I am well aware how to do it using self join. I am new to Kusto, I tried few combination with summarize, join and top operator but wasn't able to make it work.
Example:
Output:

Answer 1

you can use the arg_max() aggregation function: https://learn.microsoft.com/en-us/azure/data-explorer/kusto/query/arg-max-aggfunction.
For example:
datatable(A:datetime, B:long, C:string)
[
datetime(2020-08-20 12:00:00), 50, "abc",
datetime(2020-08-20 12:10:00), 30, "abc",
datetime(2020-08-20 12:05:00), 100, "abc",
datetime(2020-08-20 12:00:00), 40, "def",
datetime(2020-08-20 12:05:00), 120, "def",
datetime(2020-08-20 12:10:00), 80, "def",
]
| summarize arg_max(A, *) by C
C
A
B
abc
2020-08-20 12:10:00.0000000
30
def
2020-08-20 12:10:00.0000000
80

Answer 2

This isn't the most elegant solution, but it works:
let X = datatable (a: string, b: int, c: string) [
"8/24/2021, 12:40:00.042 PM", 50, "abc",
"8/24/2021, 12:40:10.042 PM", 30, "abc",
"8/24/2021, 12:40:05.042 PM", 100, "abc",
"8/24/2021, 12:40:00.042 PM", 40, "def",
"8/24/2021, 12:40:05.042 PM", 120, "def",
"8/24/2021, 12:40:10.042 PM", 80, "def"
];
X
| summarize Answer = max(a)
| join X on $left.Answer == $right.a
| project a,b,c