Table:
0
A
B
C
D
E
F
1
Locomotive
Entered service
Owner
Operator
Livery
Status
2
C501
14 May 1977
Seymour Railway Heritage Centre
El Zorro
VR Blue & gold
Preserved - Operational
3
C502
22 June 1977
Chicago Freight Car Leasing Australia
El Zorro
CFCLA Blue & yellow
Operational
4
C503
19 July 1977
Chicago Freight Car Leasing Australia
Southern Shorthaul Railroad
SSR yellow & black
Operational
5
C504
18 August 1977
Greentrains
Pacific National
Blue & yellow
Operational
6
C505
13 September 1977
Greentrains
Pacific National
Blue & yellow
Operational
7
C506
6 October 1977
Greentrains
Pacific National
Greentrains Green & yellow
Operational
8
C507
4 November 1977
Greentrains
Pacific National
Blue & yellow
Operational
9
C508
16 December 1977
Chicago Freight Car Leasing Australia
El Zorro
Blue & yellow
Operational
10
C509
10 March 1978
Greentrains
Pacific National
Greentrains Green & yellow
Operational
11
C510
11 July 1978
Greentrains
Pacific National
Greentrains Green & yellow
Operational

Questions and formulas:
Question: what is the owner of the c501
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,A1="c501"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F11,A2:A11="c501"),3))
Level: medium