If ABC Corporation has the following historical data about sales volume:   

Years	Sales	Years	Sales	Years	Sales	Years	Sales
2001	110	2006	99	2011	100	2016	110
2002	112	2007	101	2012	104	2017	111
2003	122	2008	95	2013	108	2018	109
2004	111	2009	98	2014	102	2019	114
2005	104	2010	96	2015	115	2020	112

Note: All the sale values are in thousands.

a) Which type of forecasting approach is suitable for this type of data?

b) Which forecasting technique is best to employ in order to forecast the above data? And also define the suggested technique.

c) Calculate the predicted values by employing the discussed technique in part (b) on the above data.