Let $[ \mathrm { t } ]$ denote the greatest integer $\leq \mathrm { t }$. Then the equation in $\mathrm { x } , [ \mathrm { x } ] ^ { 2 } + 2 [ \mathrm { x } + 2 ] - 7 = 0$ has :\\
(1) exactly two solutions\\
(2) exactly four integral solutions\\
(3) no integral solution\\
(4) infinitely many solutions