Which statements about indexes are FALSE? $($Select Two.$)1.$ A composite index is an index of $2$ or more columns on a table$\mathrm{.}2.$ Indexes speed up select queries but slow down writes to the table$\mathrm{.}3.$ Indexes should be avoided when joining tables$\mathrm{.}4.$ Indexes occupy additional disk space$\mathrm{.}5.$ Frequently manipulated columns should be indexed.