Fill in the array cells whose values are known, mark the activation records, and show the value of top, after each of the following calls $($done in sequence$),$ where m is an object of class StackManager:

Initial m$.$push$(6)$;m$.$push$(5)$;m$.$push$(2)$;m$.$pop$()$; m$.$pop$()$; m$.$push$(7)$;

$19$: $19$: $19$: $19$: $19$: $19$: $19$:

$18$: $18$: $18$: $18$: $18$: $18$: $18$:

$17$: $17$: $17$: $17$: $17$: $17$: $17$:

$16$: $16$: $16$: $16$: $16$: $16$: $16$:

$15$: $15$: $15$: $15$: $15$: $15$: $15$:

$14$: $14$: $14$: $14$: $14$: $14$: $14$:

$13$: $13$: $13$: $13$: $13$: $13$: $13$:

$12$: $12$: $12$: $12$: $12$: $12$: $12$:

$11$: $11$: $11$: $11$: $11$: $11$: $11$:

$10$: $10$: $10$: $10$: $10$: $10$: $10$:

$9$: $9$: $9$: $9$: $9$: $9$: $9$:

$8$: $8$: $8$: $8$: $8$: $8$: $8$:

$7$: $7$: $7$: $7$: $7$: $7$: $7$:

$6$: $6$: $6$: $6$: $6$: $6$: $6$:

$5$: $5$: $5$: $5$: $5$: $5$: $5$:

$4$: $4$: $4$: $4$: $4$: $4$: $4$:

$3$: $3$: $3$: $3$: $3$: $3$: $3$:

$2$: $2$: $2$: $2$: $2$: $2$: $2$:

$1$: $1$: $1$: $1$: $1$: $1$: $1$:

$0$: $0$: $0$: $0$: $0$: $0$: $0$:

top $=20$ top $=$ top $=$ top $=$ top $=$ top $=$ top $=$