In estimating the Free Cash Flow of a firm, we need to estimate the Capital Expenditure of the firm.Consider the following statements:$1.$ Capex is considered taking cash away from investors and hence enters the FCF Estimation as "minus Capex"$\mathrm{.}2.$ Capex is investment in the firm's fixed operating assets$\mathrm{.}3.$ Capex is a tax deductible expense that reduces estimates on FCF$\mathrm{.}4.$ Capex is a cash flow that can be reduced by selling fixed assets of the firm.Which of the following combination of statements is the most correct about capital expenditure:Select one:O a$.$ Statements $7,2,4$ b$.$ Statements $1,2,3,40.$Statements $1,2,3$ d$.$ Statements $2,3,4$ e$.$ Statements $1,3,4$